The American House Carpenters' and Joiners' Assistant

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Strona 14 - ... with each other at F, and with the longer rulers at D and E, and, being equal in length to the portions AD and AE of the longer rulers, form with them an accurate parallelogram, ADFE, in every position of the instrument. Several ivory castors support the machine parallel to the paper, and allow it to move freely over it in all directions The arms, AB and DF, are graduated and marked...
Strona 14 - Sometimes strong paste is used instead of glue ; but, as this takes a longer time to set, it is usual to wet the paper also on the upper surface to within an inch of the paste mark, care being taken not to rub or injure the surface in the process. The wetting of the paper in either case is...
Strona 14 - Take off now, with the compasses, eleven of these subdivisions, set the extent off backwards from the end of the first primary division, and it will reach beyond the beginning of this division, or zero point, a distance equal to one of the subdivisions. Now divide the extent thus set off into...
Strona 14 - Multiply the diameter by 3-1416, and the product will be the circumference ; or divide the circumference by 3-1416, and the quotient will be the diameter, RULE 2.
Strona 14 - All such regular polygons, whose number of sides will exactly divide 360 (the number of degrees into which all circles are supposed to be divided) without a remainder, may likewise be set off upon the circumference of a circle by the line of chords. Thus, take the radius of the circle between the compasses, and open the sector till that extent becomes the transverse distance between 60 and 60 upon the line of chords ; then having divided 360 by the required number of sides, the transverse distance...
Strona 14 - ... only. The relative adhesion, therefore, in the same wood, when driven transversely and longitudinally, is 100 to 78, or about 4 to 3 in dry elm ; and 100 to 46, or about 2 to 1 in deal : and in like circumstances, the relative adhesion to elm and deal is as 2 or 3 to 1. The progressive depths of a sixpenny nail into dry Christiana deal by simple pressure were as follows : One quarter of an inch, a pressure of 24lbs.
Strona 14 - From 8 times the chord of half the arc, subtract the chord of the whole arc ; one-third of the remainder will be the length of the arc nearly.
Strona 14 - When a measure is taken on any of the sectoral lines beginning at the center, it is called a lateral distance ; but, when a measure is taken from any point on one line to its corresponding point on the line of the same denomination on the other leg, it is called a transverse or parallel distance. The divisions of each sectoral line are contained within three parallel lines, the innermost...
Strona 14 - ... adhesion of different nails, and in different substances, so as to decide, without difficulty, what number, and of what length, may be sufficient to fasten together substances of various shapes, and subject to various strains. But, interesting as this subject unquestionably is, it has not been till very recently that the necessary experiments have been made to determine, 1st, the adhesive force of different nails when driven into wood of different species, 2d, the actual weight, without impulse,...

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