A key to the modern sliding-rule. Containing the description, and exlpanation [sic] of the various purposes, of that valuable instrument, ... By the Rev. W. Flower, ...
Flower, W.William.
London : printed for the author; and sold by G. Kearsly; B. White; J. Bennet, mathematical instrument maker; and G. Moore,
1768.
ESTC
Also reproduced on microfilm. Woodbridge, CT: Research Publications, Inc., 1986. The Eighteenth Century ; reel 5100, no. 7.