Obrazy na stronie
PDF
ePub

82

Some Complex Oxides of Cobalt and Nickel.

A quantity of cobalt nitrate was now mixed with soda and sodic hypochlorite, and allowed to stand in a warm place until effervescence had ceased. The precipitated oxide of cobalt was then well washed with warm water and dried, till constant, under the air pump, over strong sulphuric acid.

A sample of this oxide was then submitted in succession to various temperatures. The results were as follows:Grm.

Oxide taken o'9278

Oxide dried)

CHEMICAL NEWS,
February 21, 1879.

When the oxide Co3O5,4H2O, cbtained as described above, is boiled for an hour or two in the solution in which it is precipitated, and the amount of iodine liberated then estimated, the result points to the formation of the oxide Co12019, intermediate between Co305 and Co2O3. Theory of I for Theory of I for Co2O3. Co2O3 Grm. O'5343

Co
Taken.
Grm.

Grm.

0*1865

(Co305,4H2O)
Theory for Co305.3H2O.. 0·8770

at Ico° C. Do., 138° C.

0.8760

[merged small][ocr errors][ocr errors][ocr errors]

,, Co3O5,2H2O.. 08263 Do., 310° C. 07548 Co305, H2O.. 07756 After this experiment there was an appearance of change on the surface of the oxide.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][merged small]

0'0620

Found.

Grm. 0'4007

Grm.

(1) 0'453

[blocks in formation]

In the last experiment a fresh solution of cobalt, and a fresh solution of potassium bichromate (to standardise the thiosulphate), were used.

A quantity of the oxide of cobalt prepared by precipitating with potash and sodic hypochlorite, and boiling for some hours, then washing and drying over sulphuric acid in vacuo, was submitted to a current of air at a low red heat, and the water collected and weighed in a calcium chloride tube. The oxide was afterwards ignited to bright

redness in air.

[blocks in formation]

Oxide after ignition in a tube
Oxide after ignition in air

[ocr errors]

65'3250
65.4680

Grm.

0*1430=OH2

[merged small][merged small][ocr errors][merged small]

Grm.

C0304

0'5493

0'5293

0'5940 Percentages.

[merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][ocr errors][ocr errors][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][merged small]

O'1255

0.6255

O'5975

Found.

1683

83.90

On attempting to prepare Ni305 in the dry state by precipitating, washing, and drying in vacuo, I found that the moist precipitate gave off oxygen as soon as the liquid in which it was precipitated was removed. The moist precipitate was allowed to stand some days, and then left over the air-pump for about a week, in order to allow time for this change to be complete. Owing to some interruption, I have as yet had time to prepare only one sample by this means. The results of the analysis agree closely with the formula Ni8011,9H2O, one-ninth of the water being lost at 100° C.

Dried over H2SO4

[ocr errors]
[ocr errors]
[ocr errors]

Dried at 100° C...

Oxide Theory of Iodine
taken. for NiO11,9H2O.
Grm.
Grm.
0.1607

Found.

0'1705

O'2012

Grm. 0.1661 0.1896 0.1895

0:2375 0.2238 O'2243 0'2080 0'2005 0'2026

The water in this oxide was determined by igniting the exide in a platinum boat in a combustion-tube, and weighing the water lost by means of a calcium chloride tube.

The question, which is the true formula of the oxide I obtained, is determined by the amount of iodine liberated by the oxide on treatment with potassic iodide and hydrochloric acid. According to the formula Co2O3,3H2O, there should be liberated o'402 grm. by o'1865 grm. of cobalt; according to the formula Co3O5,4HO, 0'5343 grm. should be liberated. I found in three experiments o'5338, 0'5380, and 0'5328.

0.8723

OH2

[blocks in formation]
[ocr errors]

Grms.

[blocks in formation]

NiO

Per Cent.

Theory for Ni,O119H2O.

(1) 74'15

(2) 74°29

NEWS

, 1879

Summary.

Under the influence of the hypochlorite solution nickel and cobalt form the oxides Ni30, and Co305. On boiling the liquid containing Co3O5 it loses oxygen, and passes to the form Co12019, intermediate between Co2O, and Co305. Under similar circumstances, Ni305 appears to decompose without forming stable lower oxides, although it is probable from the results that the formation of Ni2O3 is a stage in the process. The oxides Co3O5 and Co12019 appear to be stable at a low read heat: they are distinguished from Co304 by a slight difference of colour. Co3O5 has the following hydrates:

and probably,

Co305,4H2O (dried over H2SO4)
Co305,3H2O (dried at 100° C.),
Co305,2H2O (dried at 138° C.),

CO3O5,H2O (dried at 300° C.)

Ni30, decomposes while still moist when its precipitating liquid is removed by washing. In the one experiment which was made, the resulting dried compound agreed closely with the formula Ni80119H2O. I have found that when Co3O5,4H2O is treated with cold dilute nitric acid part is dissolved with evolution of oxygen, and that part remains insoluble. I hope, in a future paper, to give the results of some similar experiments undertaken for the purpose of determining the proximate constitution of these oxides.

It may at first sight appear that the formula C012019 is inadmissible on account of its complexity, but as the iodine method clearly shows that the oxide is exactly intermediate between Co305 and Co2O3, and as the formula C012019 is the simplest formula for such an oxide, it would seem that we must accept it, especially when we consider the tendency of cobalt to form compounds vieing in complexity with many of the products of organic chemistry. It may be that the application of the iodine method to the examination of the oxides of other metals would lead to the acceptance of formulæ more complex than those now admitted. The two oxides of cobalt described in this paper, and indeed other oxides of cobalt, may be represented graphically by rings somewhat analogous to the wellknown benzine "ring" of the aromatic carbon compounds and to the zinc "ring." Thus

[merged small][merged small][ocr errors][merged small][ocr errors][merged small][ocr errors][merged small][merged small][subsumed][ocr errors][merged small][merged small][merged small][merged small]

Further Note.-I have found by experiment that when any of these peroxides are decomposed by hydrochloric acid, and the evolved chlorine passed into a solution of potassic iodide, the amount of iodine liberated is exactly equal to that which is liberated by decomposing the same weight of the peroxide in a solution containing potassic iodide. The presence of caustic alkali in large quantity appears to retard the passage of Co30, into Co12010 during the boiling process. Co305, indeed, seems to be more stable in proportion as the amount of free alkali is greater.

CHEMICAL NOTICES FROM FOREIGN SOURCES.

NOTE.-All degrees of temperature are Centigrade, unless otherwis expressed.

Comptes Rendus Hebdomadaires des Séances, l'Académie de des Sciences. No. 4, January 27, 1879. Third Reply to M. Berthelot.-M. Pasteur.-A continuation of the wearisome Claude Bernard controversy.

Researches on the Relations of Spectral Analysis with the Solar Spectrum.-J. N. Lockyer.-The substance of this paper will be found in the CHEMical News, vol. xxxix., pp. I, II.

Composition of the Banana and the Utilisation of this Fruit.-V. Marcano and A. Muntz.-In addition to the production of its fruit the banana tree is serviceable for keeping the surrounding soil moist in dry seasons, a matter of great importance in the cultivation of coffee. The fruit when ripe contains 10 per cent of cane-sugar and 3 per cent of inverted sugar.

Application of His Atomic Theory to Certain Minerals.-A. Gaudin.-Nothing short of a full translation could give a satisfactory view of the speculation contained in this paper.

Displacement of Spectral Rays Due to the Rotatory Movement of the Sun.-L. Thollon.-The author by making use of his newly invented spectroscope has observed a displacement of the solar rays perfectly well defined, and evidently approaching to the results of calculation.

Radiation of Incandescent Platinum.-J. Violle.The author has made a number of measurements of the intensity of the red light emitted by platinum at different temperatures, from 900° to 1775", the melting-point of the metal. The intensity of the red light, scarcely sensible at 500°, increases at first very rapidly and then more slowly. At 2910° its intensity is not greater than at the melting-point of silver.

Illumination of the Lines of Molecular Pressure and the Trajectory of Molecules.-W. Crookes, presented by Th. du Moncel.-The substance of this paper has appeared in the CHEMICAL NEWS, vol. xxxviii., p. 279. Electro-dynamic Phenomena and in Particular on Induction.-H. de Meaux.-The author concludes that in a closed circuit the intensity of a given current cannot be changed by the induction of an indefinite cylindrical conductor upon another of the same form by surrounding one or other of these conductors, or even both, with a concentric metallic covering communicating with the ground in its whole length.

A New Bell's Telephone, with a Loud Voice.-M. Gower. The peculiarities of this instrument are said to be due to the fact that the poles are placed as in Faraday's electro-magnet. The diaphragm is thicker, larger, and tighter than those commonly constructed. The case containing the whole is metallic, and forms a sounding-chest, and is furnished with a bell mouth which amplifies sound

84

Chemical Notices from Foreign Sources.

CHEMICAL NEWS,
February 21, 1879.

Camphen Derived from Camphor, and the Synthesis of its Homologues.-F. V. Spitzer.-This paper treats of the camphen obtained from the most infusible camphor-bichloride, and on ethyl-camphen and isobutylcamphen.

On Amalgams of Chrome, Manganese, Iron, Cobalt, Further Observations on Pyrrol and its Derivatives. and Nickel, and a New Process for Preparing Metallic-Chichester A. Bell.-An examination of the so-called Chrome.-H. Moissan.-If a concentrated solution of ethyl-pyrrol of Lubawin, and of its behaviour with hydrochromous chloride is shaken up in water with sodium chloric acid and with bromine. amalgam, a part of the sodium decomposes water, gives off hydrogen, and forms soda, which precipitates a certain quantity of chrome. The other part of the amalgam produces by double decomposition chloride of sodium and an amalgam of chrome. To be certain that no sodium remains in the mercury the amalgam obtained is kept for an hour in boiling water, stirring from time to time. If this amalgam is heated in a current of hydrogen to 350° metallic chrome is left as a black amorphous slightly coherent substance. The same method serves for preparing amalgams of manganese, iron, cobalt, and nickel. Preparation of Methyl-formic Ether and Pure Methylic Alcohol.-MM. Bardy and Bordet. Not suitable for abstraction.

bichloride discovered by the author is readily soluble in Camphor Chlorides.-F. V. Spitzer.-The camphoralcohol and ether. It melts at 155° to 155'5°. If preserved in a somewhat moist condition it easily gives off hydrochloric acid.

Cinchonic Alkaloids.-A. Claus.-Not adapted for abstraction.

Imido-thio-ether.-A. Pinner and F. Klein.-This

imido-ether.

Active Principles of Sarracenia Purpurea. -F. product is obtained by a reaction to that which yields Hétet. From this plant the author has extracted an alkaloid whose characters agree with those of veratrin. It is curious that the Sarracenia, though belonging to a remote family, should contain a poison similar to that of colchicum.

Physiological Action of so-called "Garnet "-the Residue of the Manufacture of Magenta.-M. Jousset de Bellesme.-This substance dissolved in treacle is much! more used for colouring wines than is pure magenta, which would give a shade too much bordering upon a rose. In a number of experiments made upon animals this colour always produced fatal results. One c.c. proved fatal to a cat in twelve days. The symptoms are persistent diarrhoea and rapid wasting.

Berichte der Deutschen Chemischen Gesellschaft zu Berlin
No. 14, 1879.

Action of Hydrochloric Acid upon Certain Double Salts of Sulphuric Acid.-C. Hensgen.-The author divides the double sulphates into three classes: those in which each of the sulphates present is decomposable by hydrochloric acid; those in which one of the sulphates only is attacked; and those in which neither of the component sulphates is affected. He has, in the first place, studied the behaviour of potassio-cupric sulphate, of potassic iron, alum, and of ammonio-ferrous sulphate.

Iso-heptylic Acid from B-Hexyl-iodide.-Otto Hecht and J. Munier.-Iso-heptylic acid is a limpid oily liquid of faintly rancid odour, sparingly soluble in water, and boiling at 211° to 213°.

Synthesis of Meta-nitro-cinnamic Acid.-R. Schiff. -The author obtains this acid by heating a mixture of equal molecules of nitro-benzaldehyd, anhydrous acetic acid, and sodic acetate for eight hours in a vessel provided with an ascending cooler.

On Acetylen Urea.-C. Böttinger.-A further examination of bodies which the author obtained last year on treating urea with glyoxal in presence of hydrocyanic acid.

On Hydroxylation by Direct Oxidation.-R. Meyer. -Not susceptible of useful abstraction.

On Oxypropyl-benzoic Acid and its Derivatives.R. Meyer and J. Rosicki.-A closer examination of the acid in question, which one of the authors recently obtained by the oxidation of cuminic acid.

Explanation on the Formula of Uric Acid.-R. Fittig. A question of priority.

New Analyses of the Mineral Springs of Passug, Solis, and Tiefenkasten in the Canton Grisons, Switzerland.-A. von Planta-Reichenau.-Six pages of analytical results; possibly of medical interest.

Reimann's Färber Zeitung,
No. 1, 1879.

This issue gives a very dismal account of the condition
of the once so prosperous and celebrated print-works of
Alsace.
No. 2, 1879.

A silk merchant in Zurich is somewhat roughly handled for having advertised his silks as pure" and for having called public attention to the weighting system, which Dr. Reimann declares is carried "only to the extent of 150 per cent."

Since the cultivation of madder in France has dwindled to about one-eighth of its former extent it is proposed to abolish the red trowsers of the French army.

There is the commencement of a review of the speciEnglish exhibitors are praised, but we note the remark mens of calico-printing at the late Exhibition. Several red which is so admired in French work. that none of the English furniture-prints display the fiery

No. 3, 1879.

Following up the example about to be set by France it is proposed that the blue coats and grey trowsers of the the use of indigo, and that alizarin browns or blacks German army should be abolished, as they necessitate should be used in their stead.

No. 4, 1879.

The principal articles in this issue are a dissertation in favour of protection and complaints of injustice, or, at least, negligence, in the award of prizes at the late Paris Exhibition.

It is announced that the financial condition of the Berlin Dyers' Association is very unsatisfactory.

No. 5, 1879.

There is here an account of the sophistication of soaps with rosin, potato-flour, silicate of soda, and alumina, all of which additions except the last are declared to be positively injurious.

Les Mondes, Revue Hebdomadaire des Sciences.
No. 3, January 16, 1879.

The Telemachon.-W. Wallace, of Connecticut, is said to have invented a new apparatus under this name by which motive power can be conveyed many hundred miles without loss or difficulty.

The Telectroscope.-M. Senlecq, of Ardres, has subSpecific Rotation of Cane-sugar.-B. Tollens.-Anmitted to the examination of M. du Moncel a project for important paper, but not susceptible of useful abstraction. re-producing telegraphically at a distance images obtained

NEWS

21, 1879.

in the camera. The apparatus is based upon the property possessed by selenium of offering an electric resistance variable according to the degrees of light.

No. 4, January 23, 1879.

A

WATTS'S DICTIONARY OF CHEMISTRY.

Seven Volumes, 8vo., price £10 16s. 6d. DICTIONARY of CHEMISTRY, and the Allied Branches of other Sciences; founded on that of the late Dr. Ure. BY HENRY WATTS, B.A., F.R.S.; assisted by eminent Scientific and Practical Chemists.

A man is said to have died in great torment from having struck a match upon his thumb-nail, when a minute frag-would point to this work as a model upon which others might be ment of phosphorus lodged under the nail and brought on a violent inflammation, which extended to the shoulder. According to the Revue Britannique ether is in common use as a stimulant in Drapers' Town, in Ireland, where its odour can be recognised at the distance of half a mile! The grass in Hyde Park is said to be strewed with empty ether-bottles which ladies of fashion have thrown out of the windows of their carriages.

"The English language is not rich in lexicons of science. We framed. To the practical analyst this work must prove of the utmost value-to the philosophical investigator it must, as the record of all former labours, be a great gain-and to the student who is true to his studies, it will prove an ever-ready guide. Our manufacturers know the value of chemistry, and are many of them experts in the special branches of the science which bear on their particular industries. They require to know the latest discoveries, and to keep them as it were in stock until the march of improvement renders it necessary to apply them. This Dictionary' places them in possession of these desiderata."-Athenæum,

M. Audouin recommends chromic oxide as the most THIRD SUPPLEMENTARY VOLUME

refractory material known for fire-bricks, crucibles, &c. It resists the highest known temperatures, and is attacked neither by oxides of iron nor by silica.

No. 5, January 30, 1879.

According to Dr. Draper the rain-fall at New York has been continuously decreasing since 1869.

No. 6, February 6, 1879.

French Production of Wine.-The total production of wines for 1878 was 48,000,000 hectolitres, and that

(VOL. VIII.), completing the Record of Chemical Discovery to the year 1877. In Two Parts, of which the First is now ready, pp. 844, price 36s. cloth.-Part II. in the Autumn.

"We cannot give this volume greater praise than by saying that it is worthy of the European reputation which Mr. Watts's 'Dictionary' has already acquired as a standard work of reference."-Bristol Mercury. London: LONGMANS and CO.

COMPLETION OF THE SEVENTH EDITION. Complete in Four Volumes, with 2500 Woodcuts, price £7 7s. cloth, or £8 16s. half-bound in russia.

of cyder and perry 12,000,000. Half a million hectaresURE'S DICTIONARY of ARTS, MANU

of vineyards have been annihilated by the phylloxera.

It appears that “ green oysters are sometimes fraudulently prepared by steeping them in a solution of a salt of copper.

Simple Method of Detecting Magenta in Wines, Fruit-syrups, &c.-Prof. Flückiger adds to portions of the sample, dilute if needful, recently-prepared chlorine and bromine water. If genuine the colour in both becomes a faint yellow. If magenta is present chlorine produces a deep dirty tint and bromine a violet colour, followed in time by the formation of violet flocks. Neither reagent destroys the colour.

La Lancette Belge, January 15, 1879. According to statistical returns, sulphate of copper has caused the death of 77 persons in Belgium during the last ten years. The phosphorus obtained from matches has proved fatal to 170, verdigris to 33, sulphuric acid to 30, and cantharides to 24.

MEETINGS FOR THE WEEK.

[blocks in formation]

"Dwelling Houses Their
Sanitary Construction and Arrangements," by
Dr. W. H. Corfield, M.A. (Cantor Lectures.)
London Institution, 5.

TUESDAY, 25th.-Civil Engineers, 8.

Royal Institution, 3.
Prof. Schäfer.
Anthropological, 8.

WEDNESDAY, 26th.-Society of Arts, 8.

FACTURES, and MINES, containing a Clear Exposition of their Principles and Practice. The Seventh Edition, re-written and enlarged. Edited by ROBERT HUNT, F.R.S., Keeper of Mining Records; assisted by numerous Contributors eminent in Science and familiar with Manufactures.

Also VoL. IV. separately, completing the work to the present time, 8vo. with 440 Woodcuts, price 42s.

London LONGMANS and CO.

PROFESSOR ALLEN MILLER'S CHEMISTRY.

ELEMENTS
LEMENTS OF CHEMISTRY, Theoretical

late Professor of Chemistry in King's College, London.

PART I.-CHEMICAL PHYSICS, Sixth Edition, revised throughout, with additions, by HERBERT MACLEOD, F.C.S. 8vo., with 274 Woodcuts, price 16s.

PART II. INORGANIC CHEMISTRY, Sixth Edition, revised throughout, with additions, by C. E. GROVES, F.C.S. 8vo., with 376 Woodcuts, price 21S.

PART III.-ORGANIC CHEMISTRY, New Edition,
revised throughout, with additions, by H. E. ARMSTRONG, Ph.D.,
F.C.S., and C. E. GROVES, F C.S.
[In the press.

London: LONGMANS and CO.
WORKS BY C. T. KINGZETT, F.I.C., F.C.S.
Recently published, in 8vo., with 23 Woodcuts, price 128.

HISTORY, PRODUCTS, and PROCESSES

of the ALKALI TRADE, including the most recent improve. ments. By C. T. KINGZETT, F.I.C., F.C.S., &c., Consulting Chemist. "The value of Mr. Kingzett's work is great, and it places the profession under a profound obligation."-Chemical News.

"We have no doubt that Mr. Kingzett's volume will enjoy the welcome reception it deserves, both at the hands of those more par"Animal Development," ticularly interested in alkali and from the general public."-Pharmaceutical Journal.

"Indian Pottery at the Paris Exhibition," Dr. Birdwood, C.S.I. Geological, 8.

THURSDAY, 27th.-Royal, 8.30.

Royal Institution, 3. "Sound," Prof. Tyndall.
Philosophical Club, 6.30.
London Institution, 7.

FRIDAY, 28th.-Royal Institution, 9.

The Sorting Demon of Max

[blocks in formation]

"Those engaged in the trade, especially managers, will be best able to appreciate Mr. Kingzett's work. They will find in it not only a most interesting account of the history of what is going on every day before their eyes, but valuable hints and suggestions as to improved processes."-Birmingham Daily Gazette.

By the same Author, in 1 vol. 8vo., price 18s.

ANIMAL CHEMISTRY, or the Relations

of Chemistry to Physiology and Pathology; a Manual for Medical Men and Scientific Chemists.

London: LONGMANS and CO.

PROF. ODLING'S CHEMISTRY FOR MEDICAL
STUDENTS.

Now ready, a New Edition, illustrated with 71 Woodcuts of Micro-
scopical Preparations and Chemical Apparatus, price 6s.

A HANDBOOK OF PRACTICAL TELE- A COURSE of PRACTICAL CHEMISTRY,

GRAPHY. By R. S. CULLEY, Member Inst. C.E. (Adopted by the Post Office and by the Department of Telegraphs for India.) The Seventh Edition, thoroughly revised and enlarged.

London: LONGMANS and CO.

arranged for the use of Medical Students, with express reference to the Three Months' Summer Practice. By WILLIAM ODLING, M.A., F.R.S., Professor of Chemistry in the University of Oxford. Fifth Edition, thoroughly revised.

London: LONGMANS and CO.

[blocks in formation]

The first number of the Monthly Series (February, 1879) is
Now Ready.

Price One Shilling and Sixpence.
CONTENTS.

I. "Progress"-The Alleged Distinction between Man and
Brute.

II. Matter Dead-Roger Bacon and John Dalton.

III. A Contribution to the History of Electric Lighting. By
W. Mattieu Williams, F.C.S., F.R.A.S.

IV.

CHEMICAL NEWS,
Feburary 21, 18:9.

JUST PUBLISHED, 4th EDITION.
Ios. 6d. cloth, Demy 8vo., pp. 420,

THE

PATENTEES' MANUAL.

A Treatise on the Law and Practice of Letters Patent, especially intended for the use of Patentees and Inventors.

[blocks in formation]

Of the Middle Temple, Barrister-at-Law, and
J. HENRY JOHNSON,

The Problem of Flight-Ballooning in Arctic Exploration. Solicitor and Patent Agent, Assoc. Inst. C.E. 47, Lincoln's

V. Electric Lighting. By Prof. W. E. Ayrton.

VI. Instinct or Reason?

VII. New Achromatic Microscope.
Safe Anæsthesia.

VIII.

Inn Fields, W.C., and Glasgow.

This Edition, much enlarged, gives a practical reference to every reported case of importance, and contains all the and Patentees can require.

IX. On the Transmission of Power by Means of Electricity. By information on the law and practice of Patents Inventors

Profs. Elihu Thomson and Edwin J. Houston.

Correspondence-The Band-Pattern in Animals-The Sea-Serpent
Reviews of Scientific Works-Science Notes-Proceedings of

Scientific Societies.

London: 3, Horse-Shoe Court, Ludgate Hill.

Appointment wanted by a Chemist of 15 years'

standing. A good Analyst, and has had experience as Manager of Chemical Factory. Good testimonials. No objection to go abroad. -Apply to F. I. C., care of Mr. W. J. Gordon, 15, Holborn Viaduct, London. E C.

The Appendix contains the Statutes and Rules, and a
summary of the Laws of all Foreign States and British
Colonies.
London: LONGMANS and CO.

A Manager of Tar and Ammonia Distillery will DYERS,

be disengaged on February 10, and will be open for Re-engagement. Advertiser has a good practical knowledge of the business, and is a steady energetic man.-Address No. 60, CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C.

Situation wanted by a Competent Analyst as

Assistant or Principal. Good teacher. Apply, Public Analyst, CHEMICAL NEWS Office, Boy Court, Ludgate Hill, London, E.C. CHEMICAL BALANCE.

Wanted, new or good secondhand, to turn

distinctly with 1-200th of a grain, and having short pan for taking specific gravities.-Address, Box 7, Arbroath, N.B.

Wanted, a Situation in Chemical Works by a

German Chemist, who has had a complete University education and some years practice in large Chemical Works on the Continent.. First class references at hand.-Apply to S. 4017, care of M. Rudolf Moss, Cologne, Germany.

420 pp., Royal 32m0., French morocco, gilt edges, price 5s.,
FOR CHEMISTS,
POCKET-BOOK
CHEMICAL MANUFACTURERS, METALLURGISTS,
DISTILLERS, BREWERS, SUGAR REFINERS,
PHOTOGRAPHERS, STUDENTS, &c., &c. By THOMAS BAYLEY,
Assoc. R.C. Sc. Ireland, Analytical and Consulting Chemist, Demon-
strator of Practical Chemistry, Analysis, and Assaying, in the Mining
School, Bristol.

Synopsis of Contents.

Atomic Weights and Factors-Useful Data-Chemical Calculations -Rules for Indirect Analysis-Weights and Measures-Thermometers and Barometers-Chemical Physics-Boiling-points, &c.Solubility of Substances-Methods of obtaining Specific GravityConversion of Hydrometers-Strength of Solutions by Specific Gravity-Analysis-Gas Analysis-Water Analysis-Qualitative Analysis and Reactions-Volumetric Analysis-Manipulation-MineralogyAssaying Alcohol Beer - Sugar - Miscellaneous Technological Matter relating to Potash, Soda, Sulphuric Acid, Chlorine, Tar Products, Petroleum, Milk, Tallow, Photography, Prices, Wages, &c. London: E. and F. N. SPON, 46, Charing Cross. New York: 446, Broome Street.

84 pages, with 136 Plates, demy 8vo., cloth, 30s.
SPECTRA.

Wanted, by a Hungarian Gentleman, a PHOTOGRAPHED

Situation in a Drug House. Understands German, English, and book-keeping, and has a thorough knowledge of goods. Having good connections abroad would be glad to travel. Highest references. -L. S., 5, Cheverton Road, Hornsey Lane.

Wanted, in a Chemical Laboratory in London,

a Partner with about £250; one acquainted with analyses of phosphates preferred.-Address, F.C.S., Messrs. Deacon and Co., 154, Leadenhall Street.

FOR SALE.-48

Plumbago

Crucibles, assorted, Nos. 40, 60, 80, and 100; never been used; no reasonable offer refused.-Address, in first instance, G. Blower, 38, Whitmorereans, Wolverhampton.

ALLIANCE AND DUBLIN CONSUMERS'

[blocks in formation]

One

Hundred and Thirty-six Photographs of Metallic, Gaseous, and other Spectra, Printed by the Permanent Autotype Process, with Introduction, Description of Plates and Index, and with an extra Plate of the Solar Spectrum (showing bright lines) compared with the Air Spectrum. By J. RAND CAPRON, F.R.A.S.

[ocr errors]

Mr. CAPRON has earned the thanks of Spectroscopists for the large amount of useful work which he has performed for them in the way of preliminary investigation. No exact scale or measurement accompany the photographs, and they will be chiefly useful in indicating by comparison with each other the lines which belong to particalar metals and the conditions under which particular lines are produced. But although no exact measurements are given, and although the photographs vary very perceptibly in length, nearly all show lines which can be used as reference lines, by measurement from which the wave-lengths of the metal lines can be determined. The advantages of the photographic method are noticed by the author as follows:-Absolute truth is everything in spectroscopic work, and the very best draughtsman, working with the most perfect micrometer, cannot, even at the expense of a vast amount of labour,

he Directors of this Company are prepared equal in accuracy a good photograph of a set of spectral lines.

[blocks in formation]

MR. COX, VALUER OF CHEMICAL PLANT, H. C. LEA, 706 and 708, SANSOM STREET, PHILADELPHIA, has in the

offers his services on the usual terms. Twenty years' experience, Estimates for all description of plant, plans, &c.-Glenmohr

House, New Charlton London, S.

Press the EIGHTH EDITION, Revised from the
Seventh Edition by the Author.

Publisher of English Editions-VAN VOORST, London.

« PoprzedniaDalej »