1. 1
   Instructions for the use of A. W. Faber's improved calculating rule

   by Pickworth, Charles Newton, 1888-

   New York, A. W. Faber [19--?]

   40 p. illus., 13 fold. pl., diagrs. 24 cm.

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2. 2
   The indicator handbook; a practical manual for engineers

   by Pickworth, Charles Newton, 1888-
   Published 1898

   Manchester, Emmott & co. [1898]

   2 v.

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