. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. a millimeter, when the tubulureleft for exhausting it is sealed off. The tubes are testedover a distance of 18 miles before being put into use. 435. WIRELESS TELEGRAPHY. Marconi transmitter withparabolic reflector. When it is desired to send a beam of rays in some def
. Mechanical appliances, mechanical movements and novelties of construction; a complete work and a continuation, as a second volume, of the author's book entitled "Mechanical movements, powers and devices" ... including an explanatory chapter on the leading conceptions of perpetual motion existing during the past three centuries. a millimeter, when the tubulureleft for exhausting it is sealed off. The tubes are testedover a distance of 18 miles before being put into use. 435. WIRELESS TELEGRAPHY. Marconi transmitter withparabolic reflector. When it is desired to send a beam of rays in some definite direction, the transmitterused by Marconi is one devised byProfessor Righi, of Bologna. The twolarge spheres, g, e, are 11 centimetersin diameter, and are separated by aspace of a millimeter. In order toconcentrate the beam of rays inthe required direction the oscillator is placed in the focal line of a parabolic cylindrical reflector. •/, paraboHc reflector; c, c, c, induction coil; a, battery; h, key. 436. AUTOMATIC TROLLEY-WHEEL GUARD. The trol-ley wheel is linked to a fork and to a counter-weight on a lever by a -—• sliding journal box. At the mo- — ment the trolley wheel leaves theconducting wire, the weight onthe lever lifts the wheel and fork,which again fall on contact ofthe wheel with the
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