. Canadian machinery and metalworking (January-June 1919). Thread Lead Indicator A simple, practical and inexpensive appliance thatindicates accuracy or inaccuracy of both internaland external threads. A check-up on set-up ofmachine, work, tap, etc.—a preventive against wastecaused by non-fitting threaded pieces. Get the details in the B-T Indicator BulletinBicknell-Thomas Company, Greenfield, // any advertisement interests you, tear it otit now and place with letters to be answered. 2i C \ NADIAN MACHINERY Volume XX

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmachinery, bookyear19