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Knight's Mechanical Encyclopedia (ed. Knight) 16 0 Browse Search
Edward H. Savage, author of Police Recollections; Or Boston by Daylight and Gas-Light ., Boston events: a brief mention and the date of more than 5,000 events that transpired in Boston from 1630 to 1880, covering a period of 250 years, together with other occurrences of interest, arranged in alphabetical order 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
in 1853, and modified by Frieschen and Siemens-Holske in 1854; but it is only within the past few years that any duplex systems have been put into successful operation, and, up to this time, only on American lines. The system invented by Joseph B. Stearns, of Boston, based upon Gentl's plan, is represented in Fig. 1806, in which the relay or receiving instrument is composed of two pairs of electro-magnets m m acting in opposite directions upon a common armature lever A. The key is the arma systems of this kind. A condenser C is placed in a shunt circuit to the magnets in the short or home circuit, in order to neutralize the effect of the extra current on the line-magnets of the relay. Duplex-telegraph. Another system of Mr. Stearns is shown in the lower part of the same figure. It is based on the arrangement of circuits known as the Wheatstone bridge, the relay or receiving instrument being placed on the bridge. The current of the main battery is divided by the rheost
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
polishing, according to the character of the tool which is brought upon the skin under treatment. See leather-finishing machine. Leather-skiving machine. Leather-slitting machine. Leather-softening machine. Leather-sorting machine. Stearns's leather-splitting machine. Leath′er-skiv′ing ma-chine′. A machine for shaving leather to a thickness, skiving off a portion of the flesh side. In the illustration, the leather is passed obliquely upward between the rollers and against it for trunk-covers, etc. The machine consists essentially of one or more rollers, which draw the leather against the edge of a horizontally arranged long knife, by which it is divided, one half passing above and the other below the knife. In Stearns's machine (Fig. 2883), the leather is drawn forward by the tooth e on the carrying cylinder C, passes between the roller O and presser-bar E, and after being split by the adjustable knife M is drawn between the carrying cylinder and the roller S<
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
achine. In Fig. 4450, an idle roller placed between the upper edges of the lower rollers facilitates the passage of the bark. A knife is placed between the rear edges of the upper and lower rollers, and presents a cutting edge to the bark as it comes from the rollers. A common use of the rosser is in saw-mills, where it is used to remove the bark from the log in advance of the path of the saw. This is to save the sawteeth from being dulled by the bark. Bark-planing machine. Stearns's machine (Fig. 4451) consists of an arm a fastened to the bearings b, so that it swings freely thereon. At the other extremity of the same arm is a disk c, carrying a pulley, and a revolving cutter-head d. These cutters are driven by a belt e, at a high velocity. The disk c has an upright rod f attached, by which the action of the shields k is controlled, they being inclined on one side or the other as the rod f is diverged from a straight line. These shields guide the cutters. The arm
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
cin et al.June 15, 1869. 93,214MansonAug. 3, 1869. 95,069AyerSept. 21, 1869. 97,586AyerDec. 7, 1869. 3. Springs in various Combinations. (continued). No.Name.Date. 104,610MansonJune 21, 1870. 111,276Thornton et al.Jan. 24, 1871. 115,379StearnsMay 30, 1871. 115,436Constable et al.May 30, 1871. 120,654MansonNov. 7, 1871. 121,532MacauleyDec. 5, 1871. 121,638Manson (Reissue.)Dec. 5, 1871. 121,745BarnesDec. 12, 1871. 124,812GreerMar. 19, 1872. 126,421SquierMay 7, 1872. 126,441Bo name of Fulton. A parallel experiment has been made by the same parties in writing the History of electric telegraphs, leaving out the names of Henry, Draper, Morse, Farmer, and others. Of course they have not heard of Hughes, Phelps, Edison, Stearns, Little, Anders, Pope, and House. One such treatise (?) is before the writer, and its complacent appropriation of all the glory is amusing. Fulton visited Symington about 1801 or 1802, and they had a pleasant chat and a trip together eight m
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
tenon. It may have either a hollow auger, which cuts the stuff away down to the shoulder (see tenon-auger); or it may be of the nature of a planing-machine, which, by revolving cutters, removes the stuff from the side, giving the shoulders at the sides, and the relish, if any (see tenon); or it may be of the nature of a mortising-machine, where chisels cut away the stuff and leave a projecting piece, which constitutes the tenon (see mortising-machine). Tenons. Tenon auger and bur. Stearns's hollow auger for spokes. Tononing-chisel. Sash and door tenoning-machine. Fig. 6302 is a machine particularly designed for sash and door work. It is provided with single cutter-heads and double copes. Both cutter heads are raised and lowered by a screw and band wheel to each, and are readily adjustable, to vary the thickness of the tenon or the depth of the shoulder, the carriage remaining stationary. The coping heads are so arranged as to be adjusted independently of the cutte
Edward H. Savage, author of Police Recollections; Or Boston by Daylight and Gas-Light ., Boston events: a brief mention and the date of more than 5,000 events that transpired in Boston from 1630 to 1880, covering a period of 250 years, together with other occurrences of interest, arranged in alphabetical order, Boston events. (search)
adly scorched, Aug. 14, 1879 Tenement houses, South Boston, five lives lost, Sep. 17, 1879 At Winthrop square, $1,000,000 of property destroyed, Dec. 29, 1879 Boston Journal Building badly scorched, Mar. 21, 1880 Beebe's Block, Winthrop square, burned, May 6, 1880 Fire Alarms. Bells on Churches to be rung, 1700 To be given by watchmen with a rattle, 1796 Bells first rang in Boston by electricity, Jan. 1, 1852 Supt. Moses G. Palmer, appointed, May 1, 1854 Joseph B. Stearns, appointed, May 26, 1856 John F. Kennard, appointed, Feb. 7, 1867 Commission, the Selectmen of the town, Mar. 31, 1651 A special, appointed by the town, Aug. 29, 1679 A board of three chosen by the City Council, Nov. 20, 1873 Companies, eight organized in the town, Aug., 1679 In commission, in the City, twenty, Dec. 31, 1850 With engines, thirty-six in all, Jan. 1, 1880 Engines, ladders and poles, with swabs, prepared, 1652 A machine, throwing water six feet