ning over 100 pages, includ- TIFIC AMERICAN Will be sent for one year—52 numbers— ing works on more than fifty different subjects, Will be postage prepaid, to any subscriber in the United States, mailed tree to any address on applicution. Canada or Mexico, on receipt of three dollars by the MUNN &… … Scientific American Supplement. THE “ALLARD” SPIRAL SCREW DRIVER HE PENNA. DIAMOND DRILL & MFG. CO. Screws are turned in by pushing the driver. BIRDSBORO, PA., Builders of High Class This is a separate and distinct publication from $1.50 $1.50 Steam Engines, Diamond Drilling and General TH«…
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