. Scientific American Volume 78 Number 01 (January 1898) . hence to the line. If all thekeys are up. it is seen that, by the alternate arrange-ment of the key contacts, the line current is alternatelymade and broken ; this causes the tongue of the relayto oscillate backward and forward, alternately closingthe circuit of the local battery through one or other ofthe pair of magnets, P,, Pj, actuating the makes the type wheel and the contact wheel re-volve continuously until a key is pressed. As soon asa key—say K—is depressed, the proper sequence ofmake and break is interrupted,
. Scientific American Volume 78 Number 01 (January 1898) . hence to the line. If all thekeys are up. it is seen that, by the alternate arrange-ment of the key contacts, the line current is alternatelymade and broken ; this causes the tongue of the relayto oscillate backward and forward, alternately closingthe circuit of the local battery through one or other ofthe pair of magnets, P,, Pj, actuating the makes the type wheel and the contact wheel re-volve continuously until a key is pressed. As soon asa key—say K—is depressed, the proper sequence ofmake and break is interrupted, when the correspondingsegment, K, comes under the brush, and the relay, andtherefore the clockwork, stops. The relative positionof the type wheel and the contact wheel is so arrangedthat when the shaft stops, the letter corresponding tothe section under the brush is just above the is a ratchet wheel, L, on the same shaft, and solong as the shaft is rotating, the ratchet, M, rides onthe top of the teeth, but as soon as the wheel stops, the. THE TBIFF IHFBOVED BALL BEABING. hardness by treatment with the Harvey process. Itwill be seen that this block really takes the place ofthe brass in an ordinary journal, and, like it, can beremoved and another inserted when it is worn part of the race being made in one piece, there isno wedging thrust transmitted to the other parts tend-ing to rupture them and loosen up the bearing. It is claimed for the common type of ball bearing, inwhich the balls touch each other, that there is no slid-ing friction. While this is true as regards contact ofballs withiraces, it is not true as regards contact betweenf he balls themselves, for in the latter case the touching THE TELESCBIFTOB, The uncouth word telescriptor has been coinedfor. the name of a most ingenious and compact type-printing telegraph instrument, the invention of anAustrian electrical engineer, Herr Bernhard machine is not to be regarded as a competit
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