EXPERIMENT WITH PAPER RINGS. EXPERIMENT WITH -PAPER RINGS. A NEW METHOD OF CONSTRUCTING PROPELLER SCREWS. 1. Grooved Cylinder. 2. Details of Grooves. 3. Doe& 4 and 5. Three-bladed Screws. substance deprived core it will re CONSTRUCTION OF A HELIX. HOW THE NAVAJO INDIANS MAKE BLANKETS., scientific american, 1887-02-12

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