Collins, A. Frederick (Archie Frederick), 1869- · Boston, Small, Maynard and company · leaf 240
em tomake a washer Vis inch thick; two mica rings tofit over the steel tube—these are shown by theblack parts in Fig. 75—and a mica disk each ofwhich is Yie inch thick and V2 inch in diameter. 1 Mica can be bought in hardware stores. Mica in every shapeand form is sold by Eugene Munsell and Co., 68… … «»#E 4__^?o/v /ROM
Steam-engines
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