The New Tinsmith's Helper and Pattern Book: A Textbook and Working Guide for the Ambitious Apprentice, Busy Mechanic Or Trade School Student

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U.P.C. book Company, 1917 - Tinsmithing - 359 pages
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Page 6 - 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 11 - From eight times the chord of half the arc subtract the chord of the whole arc, and one-third of the remainder will be the length, nearly.
Page 20 - To find the solidity of a sphere. RULE. — Multiply the cube of the diameter by .523598, and the product is the solidity.
Page 248 - Take 2 parts of sulphur, and i 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 14 - To Find the Convex Surface of a Frustum of a Cone or Pyramid. Rule: Multiply the sum of the circumference of the two ends by the slant height and half the product will be the slant surface.
Page 327 - US double eagle, $20, gold = 516 T. grains Troy weight is used for weighing gold and silver. The grain is the same as Avoirdupois, Troy, and Apothecaries' weights. • A carat, for weighing diamonds = 3.168 grains = 0.200 gramme. In gold it indicates the fineness and means 1/24 part: Thus 18 carats fine is 18/24 gold and 6/24 alloy. TABLE...
Page 329 - 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.
Page 5 - Add the square of the base to the square of the perpendicular, and the square root of the sum will be the hypothenuse.
Page 14 - Rule 1 . — Multiply the circumference of the base by the slant height, and half the product is the slant surface.

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