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Show Pneumatic Mall Delivery. Salt Lake. M trch 27, 1800. Editor Dkmocuat BJl'vlug Unit a ; dscrlplon of tlm New York piifunmtlc mall delivery will bo of interest to wiue of your readers I pruccul to filvi It. H hm ulroiulv l"'t!" recorded In ' n'tiie. or, In fact, all Hie loadlnt' scivii-llfl scivii-llfl pnb Icutlona. Tho lyaiom U now ' me'l over a ooi'sldcrnbhi portion of the oMclty.un'l Is belwr pmced through I lie Rrett city, with nil H ndjonilnu cities, which U all Now Yoik, connecting , ihrm with t!iu general otllee. ') Thfo system of pneumatic tube:, is the Invention of the chief engineer of thelliicliellor Pneumatic Tuho com pr.ny. The tube c..i-lst- ot east Iron plpvs In Mvolvo foot lengths nntl eight, and oac-tiluhMi litctte- Internal dh.iiiu. ter, bnloK bori'il smooth, and the Joliim " : bHrii? iimde with great caru to exact ilUnnient. They aro lul.l sldo by sl.lu Y noiler the city street, taking thu most ' direct lino that eould bo found heiweon 16 the dinVreui staticus. After being bored oui mnnnih these piped aro left tire eighths of nn Inch thick. Ail bends en ninilu by means of brass tubing of tight and throo-elghths Inches Internal dlaiucior, the greater size being to pro rent Jamming of Iho o.rrlors Then-plpaaaru Then-plpaaaru bent to not lean thin eight. feet radim. Short lengths "f iron plpus with a comoil boro nr.- used at th'-, th'-, JpIiiih with iho brass tubes, to gradu.d-ly gradu.d-ly Increase or re.diieti tho bore. Toe carriers arecyilpdrlcal.being two jj fwt long and seven Incite In Internal diHrtietor. and have a capacity or irom 600 to 8u0 letters. The canlers are made of Blit-bt Btocl oue-tlnriy'sewjutl of an Inch thluk and op ti nt one end. ill.) over for this opening Mug filled wlili a device widen locus It only when the ctrrler U In irw tube. Kach ciirrlur 1" tlltud Willi two bearing rings of a Oiiroiw material, "no pmcetl near each H.' emlj niakl.i the canb-r reetnide a ipool nfor tin i hi end lt ik."' Th i rlnuciwU being tlie beanngH makes It .piiMible for iho carrier t.. imverM)" V curves Thefiti rlnsts aro the only pai ls of Hie carrier which touoiies the liMldo of the tuU'. and Limy reduce iho friction fric-tion to the mlnnliiiuin. Tliu rings hut for about 1000 miles of travel The cirri, rs are propwlled Mirough the tubes by a continuous current of air, generated by a Euud Duplex air compressor, com-pressor, placed lu the imseinmit of the g-noral postotllce. This air current pisses through one tuho to thoaUii-sta-Una, mid returns through the other tube to a tank In the" engine room, , from which lank It) turn, the air Is 111 J "K'1" ,aken "l 'y eoiupieS'Or.thus K I forrulug a coniplot circuit. The ci'iu-ilU ci'iu-ilU I pressor, wliosu cylinders aro twenty-. twenty-. I four Inches In diameter by tweuiy M Inch stroke, were built by the Hand I .Url'l comp.ny. from sptciacatlous of I llu) Uaiebeiler rneuuiuUc Tube com 11 .1 eleven potiuds pressure, alilimtgh ilx I p"um'8 ls ul1 l,iaL 19 m,wr l,ol"K U3"'1' " The speed of air current, and cuin- iiit-1 qilMQlly r ,he carriers, is abuut 3000 I feet per minute. The transmitting and receiving tin- chlnery in the gueral postotllce 1s ) placed on the main floor of iho build ing. At tho end of the irutismliilug -5 lubo Is a cradle, by mens of winch the t carrier is thrown into position, similar 0 a repeating rifle. When no carrier I Is beuiK sent tho air current from the delivery pipu pusa's directly into the tube through one arm of the cradle, winch resembles the cy.ltider of a le-volver, le-volver, but whan tho cradle- is In tho ct of being thrown to pHce th cam- r lupi'Slilou, the current Is ntuoinatleally T 'witched off and goes through a by-1 pii9, being returned against the rear end of tiu eai nor as soon as it Is In pu-hlon, pu-hlon, thus starting It on Its jour-i(S jour-i(S ""y thimiijli tl tube. Immediate-lb Immediate-lb 'y ti-r Uim earner has left tho crulle. 11 " hi c nilii!uuumi:iiicil'y r.ituruud to H ita orialual position. The machine is regulated by a iIiiih lock, which aliowi. a headway of not less than six seconds to encn carrier. At the end of tho receiving tube In a giii, so nriango'i and reguluiH :in to effectually clone the end of ihn tube, ihu tube belmr opened by the Impact of the sirrter as ll is shut ngulnsi It, The 1 alr.etirre it pMS-.es off contlnunlly In a dlr etlnn hi right angle to thu tube through a valve to the pipe which con duels It in tho air tnnk In the eiitfiiie room. The gate closes autonintleally as soon as the carrier has t)ased oui through to the rceeivlng tnble outxhle, Hlmilitt to the dlschaigeof a Mieil from a repeating illlo. Tho mallqttuutity uf air whieh pisses out with the carrier not being silinlcient to hold the gale open, causes no Um to speak of. The m.ichincry at thb sub-stntiou Ispiacii-rally Ispiacii-rally the smuo as nt. the general post-nlllce, post-nlllce, but tho rccrivcr is somewhat dllTcre.ut, being arraugeil tvr a couiluu ous tniSHiige of tho air without the loss from tho receiving tube to Hie trmis miller. I his is fleeted by menus of a sleeve placed on ouo end of the recelv lag tuiio. The nlr current passes from tint tube 111 ouglnho nlecve in another lull.), and then goes to the tntiisiulilrr .The carrier, when It arrives, pai-ses Ihiough a gale Homewhat similar t that at iho general posliilllce, into a short, piece of lubiiigfiom which, af.er tun gate litis closed, to pievent loss or air, ll Is dropped from thu lube ami tails out on the table. Tho earliest practical uso of pnou tnailc tubes for transmission purposes niiv or kind is noted In tho kvhIcui of oueaud a ha(r Inch pipe lild In Lotnlo'n in 1853 These worn employed for sending send-ing telegrams from tho centm! slat ion of iho Electric ami International Tele graph company to thu LeMnlou Stock i.xchango, a distance or 220 yards. The system at present In use in London Is known as the "Undlul," that is, one contial and several minor pumping stations having been established, Irom these tho tubes radiate. The out-going lubes aro operated by compressed air, the In-coming tubes by exhaust, three inch tunes are used. The London system includes forty-t.wo forty-t.wo stations and tlilrty-lour miles of tubing. Liverpool, Muuehoter. Birmingham. Birm-ingham. Glasgow, Dublin and New ensile are also equipped with pneu-niittio pneu-niittio tube systems for transporting mall. The city or Berlin has an extensive ex-tensive radial system. In Purls the pneumatic lube sysieni was first Introduced Intro-duced Hi 1805. The first system of pneumatic tubes for transporting of mail in the United Stales was put In In tho city of Philadelphia in 1802, and connected the m .in poslfillco with thu sub-piistolUcu In tin. Bourse, The Hand compressor resembles two of the woolen mill engines placed sldo by hide, of liOO horse power each. li p.. ihts may be accepted and read bv sumo of your readers who have not lud a chuiico lo see or even red or anything of the klni . 1 did ll just to bhow to what extent a two-coui stump i-ysi.'iu will a fiord. Would like to hear from somo other j on same subject. P. S. I bavo not noticed anything lately rroai our S.ui Francisco corro spoinlenl. I expect ho has lecelved a knockout blow fnnn his sh uth, a Mr. Finny, Skinny, or Grlnmiy. Would liko to liuar from them. Yours, SlMl'SON. |