http://communitybuilder.info Mon, 05 May 2008 11:46:21 +0000 http://backend.userland.com/rss092 en A better arrangement for accomplishing the automatic switching on the part of the generator is to make no use of the crank shaft as a part of the conducting path as is the case in both Figs. 74 and 75, but to make the crank shaft, by its longitudinal movement, ... http://communitybuilder.info/a-better-arrangement-for-accomplishing-the-automatic/ This instrument was ordinarily mounted in a wooden box together with the induction coil, which is shown in the upper portion of the figure. The Blake transmitter has passed almost entirely out of use in this country, being superseded by the various forms of granular instruments, which, while much more ... http://communitybuilder.info/this-instrument-was-ordinarily-mounted-in-a-wooden/ Continuing the circuit through the winding itself, it passes to the center pin projecting from the left-hand end of the armature shaft; thence to the spring _4_ which rests against this pin; and thence to the terminal wire _3_. Normally, this path is shunted by what is practically a short ... http://communitybuilder.info/continuing-the-circuit-through-the-winding-itself/ Manufacturing Company, of Buffalo, New York. The circuits of such sets do not differ materially from those of the ordinary desk telephone set. [Illustration: Fig. 160. Kellogg Common-Battery Desk Set] [Illustration: Fig. 161. Dean Common-Battery Set] Circuits of Common-Battery Telephone Sets. The complete circuits of the Kellogg desk-stand arrangement are ... http://communitybuilder.info/manufacturing-company-of-buffalo-new-york/ In 1893, Oliver Heaviside proposed that the inductance of telephone lines be increased above the amount natural for the inter-axial spacing, with a view to counteracting the hurtful effects of the capacity. His meaning was that the increased inductance--a harmful quality in a circuit not having also a harmfully great ... http://communitybuilder.info/in-1893/ CHAPTER II ELECTRICAL REPRODUCTION OF SPEECH The art of telephony in its present form has for its problem so to relate two diaphragms and an electrical system that one diaphragm will respond to all the fundamental and harmonic vibrations beating upon it and cause the other to vibrate in exact ... http://communitybuilder.info/chapter-ii-electrical-reproduction-of-speech/ No definite limit may be set to apply to all conditions but it may be safely stated that under ordinary circumstances no more than ten stations should be placed on a non-selective line. Twenty stations are, however, common, and sometimes forty and even fifty have been connected to a single ... http://communitybuilder.info/no-definite-limit-may-be-set-to-apply-to-all-conditions/ In general it may be said that the packing difficulty has been almost entirely eliminated, not by the employment of remedial devices, such as those often proposed for stirring up the carbon, but by preventing the trouble by the design and manufacture of the instruments in such forms that they ... http://communitybuilder.info/in-general-it-may-be-said-that-the-packing-difficulty/ Local currents, therefore, are generated, circulating between the two adjacent metals, and, as a result, the zinc plate and the electrolyte are needlessly wasted and the general condition of the cell is impaired. This is called _local action_. _Amalgamated Zincs._ Local action might be prevented by the use of chemically ... http://communitybuilder.info/local-currents/ Swedish or Norway iron wire about .02 of an inch in diameter. The diameter and the length of the coil, and the relation between the number of turns in the primary and in the secondary, and the mechanical construction of the coil, are all matters which are subject to very ... http://communitybuilder.info/swedish-or-norway-iron-wire-about/