Simmons, Roger Edwin. [from old catalog] · Harrisburg, Pa., W. S. Ray, state printer · leaf 103
Fig. 14.—Manufacture of mine sprags in Xortbern Pennsylvania. … Fig. 15.—Drawing sliowing standard dimensions of a mine sprag. 87 Table 55b.—Wood for Sprags, year ending June, 1912. <H >^ Grown in Grown Out Quantity. O Pennsyl- of Penn- O od vania. sylvania. tH .a Kind of Wood. d a d 1 a a ■ F^ o dn ^_, ■° Feet 0) > 03 Tota 0) w fe White oak, Hickory,…
Woodwork · Lumber trade · Forests and forestry
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