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The Sheet metal worker's instructor : for zinc, sheet iron, copper, and tin plate workers, and others, containing a selection of geometrical problems, also practical and simple rules for describing the various patterns required in the different branches of the above trades (1906)

Warn, Reuben Henry · Philadelphia : Henry Carey Baird & Co. · leaf 276

An illustration from The Sheet metal worker's instructor : for zinc, sheet iron, copper, and tin plate workers, and others, containing a selection of geometrical problems, also practical and simple rules for describing the various patterns required in the different branches of the above trades, 1906, leaf 276
203 What is the number of supevficial square feet con- tained in a plate of iron measuring 6 feet 9 inches long, by 3 feet 3 inches wide ? Figure 79. 6 75=6 feet 9 inches. 3-25=3 feet 3 inches. 3375 1350 2025 21-9375=21 feet 11^ in., or nearly 22 square feet. TRIANGLES. Fig. 82. Fig. 83. Fig. 84. … To find the area of a triangle, whether it be isos- celes, scalene, or right-angled. EuLE— Multiply the base AB, by the perpendic- ular C D, and half the product will be the area. Examples. Required the area of a triangle, whose base is 33 inches, and perpendicular 40 inches ? Figure 82. 32 40 2)…

Sheet-metal work

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