The New Tinsmith's Helper and Pattern Book: A Textbook and Working Guide for the Ambitious Apprentice, Busy Mechanic Or Trade School Student, Giving a Practical Explanation of the Properties of Circles, the Mensuration of Surfaces and Solids, Simple Geometrical Drawing ... with Ninety-two Tables and Many Shop Kinks, Recipes, and Formulas

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U.P.C. book Company, 1920 - Tinsmithing - 359 pages

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Page 5 - To Find the Area of a Regular Polygon When the Side Only is Given. Rule: Multiply the square of the side by the multiplier opposite to the name of the polygon in the ninth column of the following table, and the product will be the area.
Page 10 - From eight times the chord of half the arc, subtract the chord of the whole arc, and divide the remainder by 3, and the quotient will be the length of the arc, nearly.
Page 19 - To find the solidity of a sphere. RULE. — Multiply the cube of the diameter by .523598, and the product is the solidity.
Page 235 - Take 2 parts of sulphur, and 1 part, by weight, of fine black lead ; put the sulphur in an old iron pan, holding it over the fire until it begins to melt, then add the lead, stir well until all is mixed and melted, then pour out on an iron plate or smooth stone. When cool, break into small pieces. A sufficient quantity of this compound being placed upon the crack of the iron pot to be mended, can be soldered by a hot iron in the same way a tinsmith solders his sheets. If there is a small hole in...
Page 13 - To find the surface of the frustum of a cone or pyramid, RULE. Multiply the sum of the perimeters of the two ends by the slant height, and half the product will be the slant surface ; to which add the areas of the two ends, and the product wtti be the whole surface.
Page 314 - Ib. = 5760 grains. Troy weight is used for weighing gold and silver. The grain is the same in Avoirdupois, Troy, and Apothecaries
Page 13 - Rule 1 . — Multiply the circumference of the base by the slant height, and half the product is the slant surface.
Page 258 - As there are many gauges in use differing from each other, and even the thicknesses of a certain specified gauge, as the Birmingham, are not assumed the same by all manufacturers, orders for sheets and wires should always state the weights per square foot, or the thickness in thousandths of an inch.
Page 273 - TO ASCERTAIN THE WEIGHTS OF PIPES OF VARIOUS METALS, AND ANY DIAMETER REQUIRED. Rule. — To the interior diameter of the pipe, in inches, add the thickness of the metal; multiply the sum by the decimal numbers opposite the required thickness, and under the metal's name; also, by the length of the pipe in feet; and the product is the weight of the pipe in Ibs.
Page 316 - The GRAM is the primary unit of weights, and is the weight in a vacuum of a cubic centimeter of distilled water at the temperature of 39.2 F.

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