Show from the he jagdon quarterly revl review w the electric telegraph barms barns chemical recording telegraph and ity its operation are thua tiiu described there ata are but two kinds of telegraph used by the co company m p ay liv lip th needle telegraph and a few of the Che chemical recording telegraphs graphs orbain of Bain tie the tte latter instrument strikes the spectator r higie hitre awre pem pea perhaps aps than the nimble bowl i ng needie needle need e apparatus bu its a achion tion is equally simple slits of variable a able length representing letters according to the alphabet in the note nofe are punched ou out t from a lonc lone strip of p paper ader aver called the Ines message sage strip sto winch which is is placed between a revo revolving lying cy linder linar and a toothed spring the battery is connected with the cylinder the wire which goes from station station to station is joined to t the ile lle sprig spring As dry paper is is a ii non con duc torno electricity passes while the u n pierce d portion of the massage missag slip interpose infernos inter nos dos V 4 between the be ry lineer under and the toothy tooth but when he uie tooth drop sinto a sp space and n d donies in contact with the ne raa ran cylinder r if the e I 1 current r nt flows if we a now noay transfer our attention to me the station stun at which the message is I 1 received we find a similar cylinder revolving at a regular rate rab a I 1 an and d a metal pin depending from ahr the en end t d of the tile tele telo telegraph grap crap k wire wi repressing pressing il uon agri it put tit in in this case the hie paper between the cylinder and ana and the pin has benefi i washed with a solution of slate of potash which electricity lias has the effen t of changing to prussian blile bitle at the point where wiler the pin touches it therefore as the chemically prepared paper moves under the pin a blue line ithe is formed of the lle ile lie same length as the tile slits al at theother the other end which regulate the duration ir b of f the electric thus every letter punched upon the message strip is faithfully transferred to I 1 its distant fellow such is the celerity with which the notation is transmitted by this method that in an experiment performed by M le verrier and dr lardner before committees of the institute u te and the legislative assembly at paris dispatch cs es were sent 1000 mils miles at the rate of nearly words an hour I 1 in ordinary practice however the speed is limited to th the erate rate at which an expert clerk can cah punch out the holes which as is hot above a hundred per minute tf where mere the object was 0 o fora ward ard long documents sueh such ch as a speech a number berof of persons pei per sons could be employed simultaneously I 1 in punching out different portions of the message and the tha message strips stripe would then be sup plied filed as ag fat as the could work Bak bakewell Ca kewell ewells copying tele telegraph graph involves also a chemical process its olie operation ration is described as follows the sending thie message writes it on I 1 a piece of tin foil lilith with a ren pen en dipped in varnish or any tiny other conducting non ting substance I 1 this message is then placed around a metal cylinder which is made to revolve at a certain regulated I 1 pace in contact with this cylinder is a blunt steel point which by the action of a screw wakes a spiral line from flom tho the top lop to the them bottom of or the ilia cylinder thu 8 joe Joy ching fu e fa every ery artion oi ide ine written essac P een e n eloping it in n contle conTie dhoti clio civit livit n with the thle steel point ia is the con ducting ind and attire at the end of the wire i is ila iIa similar it ar steel point working spirally upon a likel I 1 cylinder cyl loder ioder it will wu be at once been seen that the th eburt cur rent IV Willal ill ili always ways be transmitted ex except cepi at I 1 tho ose se portions of the atif in n fol foi 01 1 I which are the nion rion conduct ip varnish and which fhern fore ore cutoff the flow bf electricity and the chandr writing aill appear at the other V end nd of t alij e atele I 1 ea e grael lre vire ire upon a piece pece of ar ed paper rolled upon its cylinder and waving synchronously with it 1 4 1 the transmitted letter appears to be in ia a dark ground the white parts of course indicating where the current curre nL hasi beed beeh bl and when where consequently no of the chemo chero ical paper has ha taken place |