. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Magnetic coil. The steel rinc: has a pin projecting from its side that passes between two prongs, which, while permitting free up and down motion, prev^ts the ring from turning and altering the sound. Over tiie top of the phone there is clamped a tliin brass plate as a protection for the projecting screw. The transmitter. Fig. 12, interposed be-tween the key and the magnetic coil. Theformer operate
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Magnetic coil. The steel rinc: has a pin projecting from its side that passes between two prongs, which, while permitting free up and down motion, prev^ts the ring from turning and altering the sound. Over tiie top of the phone there is clamped a tliin brass plate as a protection for the projecting screw. The transmitter. Fig. 12, interposed be-tween the key and the magnetic coil. Theformer operates the magnet of tlie transmitterthe object of which is to send uniform currentsto the line, and also to short-circuit the phone,each time the coil battery circuit is broken,and thus obviate the annoyance which wouldotherwise be caused by the violent dischargeclose to the diaphragm. In a small magnet. Fig. 13, is stored the en-ergy which is exerted on the line for the purpose of operating the phones. As it is necessary to produce an instantaneous dis-charge, a condenseris connected around the points ofthe transmitter, which makes and breaks the circuitaround the coil. The key. Fig. 14, is
Size: 2385px × 1048px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
