http://developerlive.info Mon, 05 May 2008 13:02:53 +0000 http://backend.userland.com/rss092 en In Fig. 185 is shown exactly the same arrangement, with the exception that the talking apparatus illustrated in detail at Station A is that of the Kellogg Switchboard and Supply Company. Otherwise the circuits of the Dean and the Kellogg Company, and in fact of all the other companies manufacturing ... http://developerlive.info/in-fig/ Series and Multiple Connections. When a number of voltaic cells are joined in series, the positive pole of one being connected to the negative pole of the next one, and so on throughout the series, the _electromotive forces_ of all the cells are added, and the electromotive force of the ... http://developerlive.info/series-and-multiple-connections/ A complete K.B. lock-out telephone is shown in Fig. 190. This is the type of instrument that is usually furnished when new equipment is ordered. If, however, it is desired to use the K.B. system in connection with telephones of the ordinary bridging type that are already in service, the ... http://developerlive.info/a-complete-k/ Great use is made in the design of telephone circuits of the fact that the electromagnets, which accomplish the useful mechanical results in causing the movement of parts, possess the quality of impedance. Thus, the magnets which operate various signaling relays at the central office are often used also as ... http://developerlive.info/great-use-is-made-in-the-design-of-telephone-circuits/ TABLE V Temperature Coefficients +---------------------------+-----------------------------+ | PURE METALS | TEMPERATURE COEFFICIENTS | +---------------------------+--------------+--------------+ | ... http://developerlive.info/table-v-temperature-coefficients/ This defect may in some measure be reduced by making the ringers of low impedance. This is the general practice with series telephones, the ringers ordinarily having short cores and a comparatively small number of turns, the resistance being as a rule about 80 ohms. Bridging Systems. Very much better ... http://developerlive.info/this-defect-may-in-some-measure-be-reduced-by/ Magnet Wire. The wire used in winding magnets is, of course, an important part of the electromagnet. It is always necessary that the adjacent turns of the wire be insulated from each other so that the current shall be forced to pass around the core through all the length of ... http://developerlive.info/magnet-wire/ Lalande Cell:--A type of cell, specially adapted to constant-current work, and sometimes used as a central source of current in very small common-battery exchanges is the so-called _copper oxide_, or _Lalande cell_, of which the Edison and the Gordon are types. In all of these the negatively charged element is ... http://developerlive.info/lalande-cell/ The diagram of Fig. 68 is merely intended to illustrate the principle involved. In the practical construction of magneto generators more than one bar magnet is used, and, in addition, the conductors in the armature are so arranged as to include a great many loops of wire. Furthermore, the conductors ... http://developerlive.info/the-diagram-of-fig/ The position of the deepest notch, _i.e._, the selective notch, on the circumference of the segment at any station depends upon the number of that station; thus, the segment of Station 4 will have a deep notch in the sixth position; the segment for Station 9 will have a deep ... http://developerlive.info/the-position-of-the-deepest-notch-i/