Srientific American. OCTOBER 15, 1887. | 243 more than half-its depth -the. sifter is made closed ot ment can be very accurately ‘effected without grinding AN ADJUSTABLE PITCH SCREW PROPELLER. the bits for such purpose, as has been common hitherto. imperforate, the other part being made of fine… … room of a house, where most convenient, without seat- shown in the accompanying illustration, and has been tering dust over clothing and furniture. patented by Messrs. William J. Steves and Andrew J. ———-@20+- CUTTER HEAD. AN IMPROVED SIGNALING APPARATUS. Hill, of -Mechaniecsville, N. Y. A sleeve,…
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