rmed by the meeting of carefully ground faces at an An Electi-lc Clironosraph. angle of about 110°. These edges bear upon agate four hours is sufficient for any observation. A small mirror is placed on the pendulum support An electric chronograph, on which Profs. Crehore planes, on which the… … lead on the tion in the air- HALF-SECOND PENDULUM AFFABATUS. paper. When tight chamber. the winner In the flash breaks the tape, the circuit is made and broken, and light apparatus a light metal box is mounted on a stand head as possible without interfering with the motion of the pencil point makes…
Patents · Munn · Wheat · Scientific American · Fiftieth · Winter wheat · Prize essay · Fiftieth anniversary · Fifty years · Anniversary number · Sewing machine · Large number · Trade mark · Half century
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