Blessing, George F. (George Frederick), 1875-1921, Darling, Lewis A. (Lewis Andrew) · New York, J. Wiley & sons; [etc., etc.] · leaf 44
SOeKET^Ol X. SCEEWO 10,9 SLEEDLEPOXUr 11U l-EAD g Fig. 22.— Compass Outfit Complete. sign of the compass should be such that the head and knee joints allow free movement of the parts and at the same time give proper rigidity. They should be so designed as to exclude dirt and moisture and should fit…
Mechanical drawing
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