hide Matching Documents

The documents where this entity occurs most often are shown below. Click on a document to open it.

Document Max. Freq Min. Freq
Knight's Mechanical Encyclopedia (ed. Knight) 4 2 Browse Search
The Daily Dispatch: February 18, 1861., [Electronic resource] 1 1 Browse Search
View all matching documents...

Your search returned 5 results in 4 document sections:

tes a whistle, or the sound is recognizable as an audible expression. Bright's (English Patent) is adapted to communicate phonetic signals. It consists of an axle having a magnet and double arm; the magnet, when acted upon by electro-magnetic coils, causes the axle to vibrate or deflect in one direction, thus sounding a bell by means of a hammer-head on one arm; the subsequent reversal of the electric current causes a muffler on the other arm to stop the sound. In a more perfect form, Bright's Acoustic Telegraph consists of a hammer in connection with a lever, which is acted upon by every polarization of a set of electro-magnets by the local current, and thereupon strikes a small bell. A pair of these bells are connected to each wire; one bell is struck by the passage of the positive, and the other of the negative current, the alphabet being readily formed by the difference in their tones and the number of beats. Another form of audible telegraph consists of a wire which is
ntageously distribute the weight and allow the best arrangement of the ringing-cords. Among the devices for the mechanical ringing of bells may be cited steam acting upon a piston to vibrate the clapper; air acting upon vanes to move a pitman connected to the clapper or the axis of the bell; springs released to cause a certain number of pulsations to give a specific alarm set in operation by the touch of a trigger. See chime. Bell-tel′e-graph. A form of apparatus invented by Sir Charles Bright, in which the signals are given by strokes upon two bells of different pitch, one of which represents the movements of the needle to the left and the other to the right. Bell-trap. (Pneumatics.) One form of air or stench trap to prevent the reflux of foul air from drains. It consists of an inverted cup whose edges are submerged in the water of a basin which overflows into the drain. This permits an overflow of water, but prevents a reflux of air. See air-trap. Bel′ly. <
and a hammer and bell or other device may also be connected to sound an alarm when the pressure exceeds a given amount. See steam-gage. Re-cord′ing-tel′e-graph. A telegraph provided with an apparatus which makes a record of the message transmitted, as the symbol telegraphs of Morse and Bain, and the type-printing telegraphs of House and Hughes, in contradistinction to the indicatortele-graph of Cooke and Wheatstone, which has a pointing needle or needles, and the audible one of Sir Charles Bright, which sounds upon bells, and the Morse as at present generally used, which is read by the sounds. See List under telegraph. Recti-fi-ca′tion. Redistillation or resublimation to free a substance from impurities or from water. Rec′ti-fier. 1. A second still for redistilling spirits, or a second chamber connected to the main or primary still. In the rectifier, the low wines are redistilled to concentrate them; or high wines are farther concentrated and purified to form al
his Ministers abroad, stating that he has resolved to resist to the end all the perils of his position. The Italian. Parliamentary election returns show a large majority for the Government. --Returns from Southern Italy, although imperfect, are yet favorable. The new Indian loan had been introduced at London. It is for £3,000,000, at 5 per cent., redeemable after the year 1870. At a meeting of the Royal Geographical Society, papers were read by Sir Leopold McClintock, Sir Charles Bright, and by Colonel Schaffer, relative to the survey and the route of the projected North Atlantic Telegraph. The important case of Patterson vs. Bonaparte, after being argued before the French Tribune on the 25th, had been adjourned to the 1st of February. The decision was expected to be given in a few days thereafter. It was reported in Paris, but denied in Berlin, that France had demanded explanations of the recent warlike speeches made by the King of Prussia. The Paris B