A cased set of Whitworth taps and dies, the dies with inserted chasers, by Pratt & Whitney, U.S.A.; another nameless with adjustable diestocks of Whitworth type; a rotatable solid steel table vice by Billing & Jennings Corp.; a two-jaw drill chuck by Cushman; two wood drill stands signed Morse Twist Drill Co.; and a ½in. keyless drill chuck by Cardinal on Morse taper shank (7)

Details

A cased set of Whitworth taps and dies, the dies with inserted chasers, by Pratt & Whitney, U.S.A.; another nameless with adjustable diestocks of Whitworth type; a rotatable solid steel table vice by Billing & Jennings Corp.; a two-jaw drill chuck by Cushman; two wood drill stands signed Morse Twist Drill Co.; and a ½in. keyless drill chuck by Cardinal on Morse taper shank (7)

Lot Essay

Pratt & Whitney were amongst the first firms in America to be involed in modern interchangeability of manufacture by precision of public measurement and the establishment of limit systems. Their screw tackle was for long considered equal or even better than Whitworth's own.

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