NG.— THIS article describes a simple method of making rukherstamps with inexpensive apparatus. A thoroughlypractical article written by an amateur who has had ex-perience ni rubber stamp malting. One illustrationContained m Supplkment 1110. Price 10cents. Forsale by Munn & Co. an€ all… … ROTARY PUMPS AND ENGINES. Their Origin and Development.—An important series ofpapers giving a historical resume of toe rotary pumpand engine from 1688 and illustrated with clear draw-ings showing the construction of various forms ofpumps and engines. 38 illustrations. Contained inSUPPLEMENTS 111(9,…
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