AN IMPROVED POCKET KNIFE. Persons contemplating lysWding will find it to their advantage to subscribe for the Archi tects and Builders Edition of the 'Scientific Atinerictin.' $2.50 a year. Single copies 25c. California Borax. AN IMPROVED INK ERASER. JOHNSTON'S INK ERASER. Loss of Light through Windows. Casting Plate Glass. Bacilli. AN IMPROVED DRAUGHTSMAN'S PROTRACTOR. DUFFIELD'S DRAUGHTSMAN'S PROTRACTOR., scientific american, 1889-08-10
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