AN IMPROVED PUMP. DOBSON'S PUMP. The Names Microphone and Telephone. apparatus invented by Captain John Taylor for the transmission of signals during a fog by means of the sounds produced by the passage of compressed air through trumpets. AN IMPROVED ODOMETER OR SPOKE CYCLOMETER. HAZEN & MERRILL'S TIN CAN MACHINE., scientific american, 1887-08-27
AN IMPROVED PUMP. DOBSON'S PUMP. The Names Microphone and Telephone. apparatus invented by Captain John Taylor for the transmission of signals during a fog by means of the sounds produced by the passage of compressed air through trumpets. AN IMPROVED ODOMETER OR SPOKE CYCLOMETER. HAZEN & MERRILL'S TIN CAN MACHINE., scientific american, 1887-08-27
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