RM2ABTT1A–in Scientific American Supplement 964. HOW TO MAKE A THERMOSTAT. is ex plained in Scientifie American Supplements 1561 1563 and 1566. ANEROID BAROMETERS Scientific American Supplements 1600 and 1554. A WATER BATH Scientific American Supple ment 1464. A CHEAP LATHE UPON WHICH MUCH American Supplement 1562. Order from your newsdealer Or from MUNN & CO. 361 Broadway New York RepairsExperimentalDevices . TheBall Transmission ri FOR Please mention the SCIENTIFIC AMERICAN when writing to advertisers, -1909-07-31
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