Kingdom.]
AND SURGICAL INSTRUMENTS.
North, North Central, and South Central Galleries.
455
ei] * 10n - The index mouthpiece attached to one end ofcan ^ las an indicator to show from which room thehas been made. See the preceding cut.trutta perclia telephone.
tw ' ,ailwa y trains communicator, for communicating be-j. eei1 guard and driver, or passengers and driver, a tele-th tt P' 10n °n, in different lengths, with screw joints to suit® lengths of the carriages and the spaces between them.
percha tube and lathe-hand, as first made by thex hibttor in 1845.
Subaqueous insulated electric telegraph conductors,mattery protector.
1 , , e 'egraphic private code box. Model to illustrate theyhraulic telegraph.
ndex electro one-wire telegraph, with perforated con-ation codes.
w Lcntinietral chronometer, made by Johnston, Clerken-j.j - By means of tabulated velocities on a moveablec ’'Sj tlie speeds of railway trains, &c., are accurately as-'tamed to the hundredth part of a minute, by observ-la u merely, and without calculation.
,V° m P a rative plan of that part of the City of London . Rich was destroyed by the Great Fire in 1666; showings state at that period, and the alterations and improve-rs effected up to 1829, with historical and other notices,cl , glass pipes to insulate and protect the wires ofcctric telegraphs when placed under ground. Patent■ “ Htubular pipes,'of glazed earthenware. Manufactured^William Northen, Vauxball.
p.Chess-board, enamelled slate, executed by Mr. Magnus,1 ln )lieo.
hi ^^ishaw’s uniformity-of-time clock and telegraph;
e chanic a l domestic telegraph; and index electric tele-fe la l>h.
The alarum hell, for calling the attention of the atten-dant, being liberated by a motion similar to that of thetelegraph, gives three distinct blows; and should it, byany chance, be liberated by a current of atmosphericelectricity, the apparatus would not be deranged.
The deflector on the left of the instrument enables thecurrent to be transferred from the telegraph to the bell,and vice versa; and it can also be used, in case of aninstrument getting injured, to pass the current along theline, without stopping the communications at otherstations; with this, one wire only is required to enableevery station on a line of railway to communicate withthe whole by means of one instrument only at eachstation.
The battery is of the ordinary form, except that thecells are of porcelain and separate, and the plates are con-nected with binding screws.
By the use of an underground arrangement of con-ductors (as exhibited in combination), the cost in the firstinstance, with wire encased in lead, is very little morethan posts with wires suspended in the air; and withwire, encased in gutta percha only, much less: while thecost of maintenance is greatly reduced, and the liabilityof interference from atmospheric influence avoided.
423 Winter, J., 44 JJttlewood House, Leeds —Manufacturer.
Galvanic -walking-stick, made of a kind of oak, fromAustralia . It contains an electro-galvanic machine andbattery complete. On holding the knob in the hand, ashock is slightly felt; and by taking a piece of silver orcopper in each hand, and touching the knob on each side,the shock is greatly increased.
[The mechanical domestic telegraph consists of ana 'rang emen t of tubes formed of gutta pereha, and sup-h >ed with metallic and other mouthpieces, to which ahistle is attached. By blowing into the tube the"bristle is sounded in a remote apartment, and the mes-® a 8e can then be delivered with scarcely any elevation ofe voice through the tube, which transmits sound in aMarkable manner.—R. E.]
t ^’rougbt-iron chain pipes, with swivel joints, for pro-ving the wires of electric telegraphs under water.
^20 Harrison, C. W., & J. J., Richmond —Inventors.
0 Electro-magnetic engine, for producing a motive power11 a new p r i nc ipi e .
424 Smith, George Richard, 16 De Bouvoir Terrace,Ctiford Hoad— Inventor.
Comic electric telegraph and key board, which consistsof a mahogany case, having in front a comic face, andthree signs concealed by shutters, the featui’es of the faceand the shutters being capable of simultaneous motion byan electric current, which also rings a bell placed inside.With three signs it not only conveys every letter in thealphabet, but exhibits distinctly the ends of letters, words,and sentences. By the hell arrangement, it intimateswhen a message is about to he sent, and is made tofacilitate the deciphering of the signs. Magnetic polarity,as an indicator, being dispensed with, no electric dis-turbance in the atmosphere can render it ineffective; theinternal arrangement being very simple, it will not soonbe disordered by use.
McNair, A. & Co., 33 Oswald Street, Glasgow —Inventors and Manufacturers,lvi • °- n ^ uctor ^ or e l ectl 'i° telegraphs, consisting of a coppertube lnsu ^ ate< l wuh gutta percha, and enclosed in a leaden
Krett, Alfred, 138 Holborn Bars —Proprietor.
L,,ii and Little’s patent electric telegraph, alarum bell,DU l handle, and battery.
rgu he electric telegraph. The various letters or numerals° r j °®®nted on the dial are made by the motions of eithere acl i ^ le ' n< licators; the number of the motions foror numeral is defined by the figures on thei n< jj e the dial, commencing at all times with theh ot j l C ?' to I on the side next the letter or numeral, and whenThe p U ^ cators are used, finishing with the opposite one.iu a hmices are double, and of a circular form; and thein k . ,s in the form of a ring or horseshoe, suspendedri g l u e 0e ntre of the helices, and is deflected either to thec Urrei ° r left, according to the direction of the
th e e The poles of the magnet being equidistant fromis rendered astatic, and not affectedThe ^ en ’ es *™l magnetism,
and n]. Se ma S n ets move parallel with the coils of wiredlles °f electricity. The indicators, not being mag-is th ai % I ,er ftctly free from vibration, and the indicationbefore distinct and certain.
425 Burdett, Joseph, 28 Hanover Square, ClaphamHoad- Inventor.
Domestic telegraph, requiring only one bell for anynumber of rooms. All the rooms being numbered, wiresare brought to corresponding numbers on this machine,so that when the wire of any room is agitated, the hellwill ring and the indicator will point out the number ofthe room on the dial where attention is required.
426 Alexander, William, F.E.S.E., 52 West RegisterStreet , Edinburgh —Inventor.
Model of an electro-magnetic telegraph, worked bymeans of voltaic currents through metallic conductors,deflecting magnetic needles, and thus unveiling the lettersof the alphabet in the order required for any communi-cation. The model was exhibited at the meeting of theRoyal Scottish Society of Arts, on 15th November, 1837,after previous experiments throughout the year, to testthe practicability and efficiency of the plan, made*through a metallic circuit of four miles in the chemistryclass-room of the University of Edinburgh . It is believedby the inventor to be the first definite plan for an electro-magnetic telegraph ever shown in operation before thepublic or a scientific society. In 1837, the applicability ofelectro-magnetism to telegraphic purposes was matter ofdoubt and uncertainty, and the object of the inventorwas to solve the problem by apparatus of the most simple