



nc of a heavy pressure of air Berlin for 



i-k the ffiir ami en 



yean. Ther have 



been em- 



SrfUoal |- r 



s pooni " 



nel 



'se were maintained 

 it* through w!u h the men a tid 

 it and the excavated mat. rial was 



ies.it 



. was 



d to im.re than 8 at- 



fered with slight affection*,' i 

 under each oo 



be mm i n allowed 

 r the pressure only niu- 

 was essential 



allow 



> pass freely to the in. 

 .11.1.1. i . halo- . f j.r. mm on UM ovtaidi 

 SH a ibarupain la Ihedrmn. \ 

 , was used un-i 



rogress. It was first 

 .nice, being used on a line be- 

 ' 



Kailwa. re recently on a line be- 



is also op- 



cars, the presum- in the tanks on 



the square MM h 



>r * milrs <nn U> made 



it has been f.>un<l best to 



> stopping at stations, about every 



liki- those of a 

 s at a 



preesurv of a -..' The storage 



iployed are known as Mannesman tubes, be- 



ng up. but if a burnt 



i- in tin- n 



i Middm blaM. dangerous only 

 lmroediat.lv in front 

 ardie svHti-m <*f j r.-. 1 >ir propulsion 



raised ; 1 pn^x. The cost of 



lion han'm.f nt it is be- 



hegreat.-r than that of tl, roller 



The air is stored in tubes under the car. as 



ris * V f,-in. a,,.l u-.-l in . vln d( r^ I '. '.>, 



betislOOOpoundi '' theeqaafi lad ,aad 



to 130 



ployed by the Wei. 



ftestiualbi 



r 



hav 



maty by expansion / the 



'. l>ut i-:ir-:\ I'v raporixation of n |--r- 



tvnntairp of 



rs ami ninnini; equally 



mijir wml no 



*y sf-iii avoidi all th> .lifll.-ul- 



.1 nusrhanism as 

 mlerground 

 >lr lines. 



nmatir Tube*. Transportation tulea for 

 ng small package* br pnetimatio pressurs 

 wn establish,-,! in I.-mlon. Pn>. Vfc Una, and 

 \xxvu.-10 A 



i.. th.- iir 9 j. tt j.-r, tram i . A tthsv 



f l than 9 u<-hr> 

 lt. h eerrke was estahliehsd 



connect the main post office with a eahstatson half 

 u.t ThVoperaUon of this was so ealhv 

 factory that a system of large tubes was under. 



' connect the post office and 



ton Avenue branch post **fftfti, etH the unfit post 



I l! ' 'I | - ! ' - W il* tl ' ' ! ,\' ' ' > . 



Oej ;. i-.,; n, r - i ' . ., ' ' 

 MM eJtlM - .,-M.Ht;,,,,-? ,., l iit, : 



that 



ti 1 





about SO inches long, and *r slightly Urgrr in cir- 

 'rent* at the ends than slsswhers so as to al> 



i- % . f r. ndlH .rv- - 'i .- r opsnb 



l.^nt.an^marsss 

 .1. r a hrailway of only a few second- 



I.IMIV rrnMsil-air torpedo gin. conv 



monly called the dynamite gun, introdocsjd by 

 Edmund I.. .. X-.h: 



, ps^B 796). has attracted wide 

 military nn !* within a few yean. The air gn, 

 ,-ntion. was rerired br Mr. X efforj, of 



use for throwing higli aplosives? Up to the 

 present time 11 pneumatic dynamite guns have 



DMB - ,i |-::.-l t.. d .nines, 1 going to 



State* man-of.war ' 3 at Sandy Hook. 



hese, the 3 on th, Vesuvius.- 

 Reynolds, with the sssistance of other enginmro. 



as designed by Messrs. N.' Pmit and 

 SewalL The last 7 guns, all of : 



:t-.l ami designed by Capt. John T. 

 RapiefT. who has obtained several patents for the 

 guns. ('apt. Xnlit.ski. then a lu-utenant. became 

 acquaint 1 1! with the system, and. upon presenta- 



f the MI* State* (i< 



. was detarhed to inTestigate the matter, and 

 ts. 



pn mm 

 Eheston 



tl.n.ugh his 



tract ed A proper public interest, which eventually 

 OoJmfcMted in nn .-r.l.-r from the Tnited Stales 

 :>t. Tl..- maximum rang* of the dyne> 

 is about 9.000 yards; the artuating' air 

 or less to the squarelnrh; 

 > lfl\ m * *Sm ttn 

 The guns are ommhle of throwing 

 projectiles containing MI 100. 00.or 500 pounds 



arm sub- 

 caliber projectiles* The pressure of air does not 



in. The test.' 



I*, at Sboeburynesa. afford* a good idea 



mx ura. N ing made on land, so that 



was no doubt as to the firi point of grace or 



It was found that at 



<>f t,54S yards five soccnsive shot 



in a rectangle 7 yards long by 5-4 yards wide, a 



the acceptance 

 trials in t .tea the horizontal target 



vards (this 



being almost the siae of the 1'ntted Slates rteemer 



t was required to place a 



t. percenta^ of the number of projectile* 



thrown. All the projectiles were dropped into a 



