Woodwork for secondary schools; a text-book for high schools and colleges, prevocational and elementary industrial schools (1916)
Griffith, Ira Samuel, 1874-1924 · Peoria, Ill., Manual Arts Press · leaf 29
pering. This will be found very con-venient in all work requiring inside measurements. Suchrules will measure four or six feet plus the length of theextension. 21. Pattern-Makers Shrinkage Rule.—All metals,w h e n c a s t, shrink in cool- i n g. The amount of shrinkage d e- pends upon the kind of… … Fig. 21.Folding Rule and Extension. TOOLS AND PROCESSES. ■ 25 Under ordinary conditions, where the thickness of thecasting is about 1, the average shrinkage is as fol-lows for the following metals: Cast iron, ^ ; steel, |;brass, j\; tin, 1/12. If the castings are thicker theshrinkage will average…
Woodwork (Manual training)
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