Obrazy na stronie
PDF
ePub

following series of experiments was shown: (a) Measurement of a small rate of flow of gas by addition of hydrogen at a known rate from an electrolytic cell, and measurement of the resulting percentage of hydrogen.

(b) The rise in CO, percentage in an enclosed space due to the respiration of a small bee. A few thousandths of a cubic centimetre were detectable.

(c) The leakage of CO, and H2 from a few square millimetres of two rubber balloons was visible in a few seconds.

(d) A method of demonstrating the effect of thermal diffusion" in producing separation of hydrogen from oxygen. The method gives rapid results, which can easily be interpreted in absolute units to give values of the "Chapman constant for a mixture. A simple method of calibrating is included in the apparatus.

[ocr errors]

A demonstration, entitled Some Simple Apparatus for the Estimation of Carbon Dioxide, was given by DR. EZER GRIFFITHS, of the National Physical Laboratory.

Apples respire, generating carbon dioxide. It has been found that the atmosphere of a gas-tight chamber gradually becomes richer in carbon dioxide and deficient in oxygen, and when the carbon-dioxide content exceeds a certain value the apples are liable to become diseased. The instruments demonstrated were devised so as to provide marine engineers with a simple means of making analyses of the atmosphere in the ship's holds carrying an apple cargo.

One was of the simple burette type, in which a measured volume of the gas under test is displaced into a potash tube and then returned to the burette for measurement . after absorption of the carbon dioxide. Float valves are provided to prevent potash solution being accidentally drawn back into the burette or water swept over into the potash.

The novel feature of the second was a large hollow-barrel glass tap. Absorbent for carbon dioxide was packed into this hollow barrel. In one position of the ap a sample of gas was pumped through into a tube; in the second position the absorbent was in communication with the sample of gas resulting in an absorption of the carbon dioxide and consequent diminution of volume of the sample which was measured.

The third instrument was a large-bore tube bent into a nearly complete circle. This tube was mounted on an axis through

the centre of the circle, so that it could be partially rotated. A large drop of mercury functioned as a piston for displacing the sample of gas contained in the tube through an absorbent cartridge. The diminution in pressure was indicated on a dial gauge calibrated to read in carbon-dioxide percent

ages.

The fourth instrument was a specially designed brass pump, by means of which a sample of gas is withdrawn from the ship's hold, and then displaced through an absorbent cartridge. As in the previous instrument, the carbon-dioxide content is indicated on a dial gauge.

Nem Patents.

This list is specially compiled for The Chemical News, by Rayner and Co., Regd. Patent Agents, of 5. Chancery Lane, London, from whom all information relating to Patents, Trade Marks, and Designs, can be obtained gratuitously.

Latest Patent Applications. 19,497. Bashiloff, I.- Method of separating radium and barium salts. July 31st.

19,472.- Binz, A.-Production of heterocyclical arsenic-containing compounds. July 31st.

19,326.--Island, J. S.-Electric formation of oxides of nitrogen. July 30th. 19,578.-- Steffen,C.-Process for obtaining tricalcium saccharate. August 1st.

Abstract Published this Week. 235,363.-- Subdividing glue, etc. - Akt.Ges. Fur Chemische Produkte Vorm., H. Scheidemandel, 35, Dorotheenstrasse, Berlin, Sakom D., 13, Adolfs allee, Wiesbaden, and Askenasy P., 44, Kaiserallee, Karlsruhe, both in Germany. Glue, gelatine, or the like is obtained in small beads or grains by passing its solution in the form of drops through a cooling agent comprising a liquid miscible with the colloid, or a gas or gaseous mixture, or a liquid immiscible with the colloid, the colloid in the last case being subsequently passed through a cleansin gliquid. As miscible cooling liquids water, aqueous solutions of salts, or aqueous emulsions may be used. In using a gaseous cooling agent. the drops of colloid may be caused to pass

in countercurrent to the gas or they may be sprayed into a container in which the gas is held under pressure. Suitable immiscible cooling liquids are benzol, benzine, trichlorethylene, tetrachlorethane, carbon bisulphide, and benzyl alcohol, and suitable cleansing liquids for use in conjunction therewith are water, aqueous solutions of salts, and aqueous emulsions. The cooling liquid, if lighter than the cleansing liquid, may be superposed thereon, the specific gravity of the cleansing liquid being, if desired, increased by the addition of soluble substances, but if the cooling liquid is the substances,but if the cooling liquid is the heavier, the grains are collected and passed through a lighter cooling liquid superposed on a cleansing liquid.

Messrs. Rayner and Co., will obtain printed copies of the Published Specifications only, and forward on post free for the price of 1/6 each.

The Latest

TRADE MARKS

The following list of latest Trade Marks Published, is specially prepared for "The Chemical News," by Messrs. Rayner and Co., Regd. Patent and Trade Mark Agents, of 5, Chancery Lane, Londen, who will give all information free regarding the Registration of British and Foreign Trade Marks. SYNTHOX.

459,201.-A chemical substance to be used in the purification of Gas.-A. Johnston and Partner, Abbey House, 10, Victoria Street, Westminster, London ,S.W.1. August 5th.

BITUMITE.

460,159.-Chemical substances used in manufactures, photography or philosophical research and anticorrosives.-G. M. Callender and Co., Ltd., 25, Victoria Street, London, S.W.1. August 5th. MERCURINHAL. 457,707.-Chemical substances prepared for use in medicine and pharmacy.-C. Engelbreth, Norrebrogade 32, Copenhagen, Denmark. August 5th.

METARSENOBILLON. 459,333.-Chemical substances prepared for use in medicine and pharmacy.May and Baker, Ltd., Garden

Wharf, Church Road, Battersea,
London, S.W.1. August 5th.
CHOSCON.

459,400.-Chemical substances prepared for use in medicine and pharmacy.L. J. Sloper, 169, Wimborne Road, Winton, Bournemouth. August 5th.

The above Marks have been "accepted " by H.M. Patent Office, and unless any objection is lodged, the Marks will be duly Registered. They are, however, officially advertised for opposition, which must be lodged within one month from date quoted. Ali particulars and forms for opposition will be sent free by Messrs. Rayner and Co., 5, Chancery Lane, London.

་་ THE CHEMICAL NEWS."

The Chemical News is on sale after 12 noon every Thursday, and can be ordered through Railway bookstalls or any newsagent of standing, price 6d. per copy. It can also be sent by post to any part of the world, price 30/- per year, from the Publishing Offices, Merton House, Salisbury Square, London, E.C.4. (England).

JUST PUBLISHED. A Jubilee Volume of the RECUEIL DES TRAVAUX CHIMIQUES DES PAYS-BAS,

in honour of the 70th Birthday of

Prof. BOHUSLAV BRAUNER.

Hon. D.Sc. (Manch.), Ph. D., etc.

This publication contains the most recent scientific communications of Prof. Brauner's friends and pupils, and dealing with original researches in General, Inorganic, Analytical, Organic, Physical, and Electro Chemistry.

It comprises 350 pages with many illus. trations. Price 12s. 6d.

Applications to be sent to Dr. Druce, 26, Heslop Road, Balham, London, S.W.12.; or Dr. W. P. Jorissen, 11 Hooge Rijndijk, Leiden, Holland.

Binding The Chemical News.

The management is prepared to provide. handsome Red Cases, Gilt-lettered, and bind each six monthly volume for 5/- each, plus 9d. postage to return the bound volume.

Address, Manager, "The Chemical News," Merton House, Salisbury Square, London, E.C.4.

Publisher's

Announcements.

The following Books can be obtained from Rea & Inchbould, Merton House, Salisbury Square, London, E.C.4. :

CONFESSIONS OF GREAT SOULS,

By the REV. J. E. RoscoE, M.A. This striking work gives extracts (with comments) from the opinions of 50 great writers and thinkers in all ages on Religion. These include Bacon, Balzac, Burns, Carlyle, Cicero, Dante, Darwin, Dickens, Emerson, Faraday, Homer, Johnson, Longfellow, Maeterlink, Milton, Huntley, Napoleon, Newton, Pope, Ruskin, Shakespeare, Socrates, Spenser, Thoreau, Wordsworth, etc., etc.

The work is handsomely bound, and has a copious index for easy reference, and the work, containing as it does the gems of

thought on some of the world's greatest thinkers, and will form an acquisition to any library.

By post, 5/- net.

300 QUESTIONS AND ANSWERS ON LATIN GRAMMAR AND COMPOSITION. By J. E. RoscoE, M.A.

(Author of Dictionary of Educationists, Theological Education, etc., etc.) Confessions of Great Souls, History of

An indespensable Book for the Student or anyone desirous of rapidly and easily acquiring a knowledge of the Latin Language.

100 p.p. Post Free, 4/8.

NOW GETTING VERY SCARCE.

BACK NUMBERS AND

VOLUMES

WE have FOR SALE a limited number of the EARLIER VOLUMES and NUMBERS of the CHEMICAL NEWS and are prepared to supply orders at the foliowing rates, CARRIAGE EXTRA, (subject to the Volumes or Numbers being in stock at the date when the order is received) :

:

[blocks in formation]

"

1860-1863

1886-1903

49-88

2 19 0

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

1 11 0

out of print.

[blocks in formation]

Various numbers, parts of Vols. 117 and 118 (1918/19) are only on sale at 2s. 6d. each.

THE GENERAL INDEX TO VOLS. 1 to 100 can still be purchased at £1 1s.
(CARRIAGE PAID.)

All communications should be addressed to the MANAGER, CHEMICAL NEWS
MERTON HOUSE, SALISBURY SQUARE, LONDON, E.C.4.

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

The recent revival of interest in the history of the Sciences makes the book appeal to the general scientific public. It is also intended for use in Schools, where the History of Science occupies a place in the curriculum.

« PoprzedniaDalej »