ASTIGMATIC EYEPIECE FOE OPTICAL INSTRUMENTS. ASTIGMATIC EYEPIECE FOR OPTICAL INSTRUMENTS A SYSTEM OF PROTECTION FROM LIGHTNING. The Secret of Aerial Travel. On AN APPARATUS FOR RECORDING RESPIRATIONS. TATA'S RESPIRAGRAPH. MEYER'S SIPHON. HILL'S LIGHTNING ROD AND PROTECTOR FOR OIL TANKS., scientific american, 1889-08-31
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