Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 613
w line * To be placed between the numerator and demoninator of a vulgar fraction.t To be placed before and after the words to which they refer. OFFICIAL SIGNALS. Sign. Sign. Public mes-sage Official Tele-graph mes-sage Private mes-sage ... CallCorrection, or rub outInterruptionConclusionWaitReceipt… … Fig. 287.—Morse Transmittmg Key. Fig. 287 is a view of the Morse transmitting key. A B is a brass lever,moving in bearings at C, and provided at the end of its longer arm with a largeknob or button of some insulating material. Steel pins are screwed in at Band D, and thev are so adjusted that while…
Inventions
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