/.v/>/-:.\- TO VOLUME ii. 



485 



PI:I:\I \M:NT. 



and disadvantages ,,|. ll'.i. I2H : 

 for applicants' informal ion. 345; 

 in (Jermany against. .".(.">. ami in 

 I'nited Stale-, in favour of in- 

 ventors. :S4I ; useful within liinils. 

 345), fees for, considcrai ion of, 42": 

 ami (iovcrnment departments. lL'2: 

 for invention, titles to, 414 ; 

 public benefited by, 421 ; time, 

 extension of, proposed. 415 ; 

 walking of, 420. 

 Permanent water supply system. 



waste in, 2'.i:f. 



Permanent way, metal, 41.">, 41. 

 Thotophone, 410 411. 

 Piston water meter, 270, 277. 

 Planetary bodies, atmospheres ' 



around. 425. 



Pneumatic, despatch, circuit or con- 

 tinuous system. Siemens'*, 3I<. 

 34(5 ; air - pump of, curves for 

 cylinders of, 348 ; carriers for. 

 .'{_') : t'haring Cross branch, re- 

 moval of, 347 ; consumption of air. 

 less than in radial, 351 ; (i;xt f. 

 details of, 354 ; less than in radial. 

 351;) Cowper. Ed., recommended ' 

 by, 346 ; description of, 34 (I : 

 engines, &c., for, supplied by : 

 Easton & Amos, 354 ; esta- 

 blished at Berlin, London, and 

 Paris, 34<> ; failure reported of, at 

 Herlin, unconfirmed, 353 ; Hill. 

 Sir 11., supported by. :U(J ; injec- ' 

 tion of water into cylinder of air- 

 pump, source of power, 348 : me- i 

 chanical arrangements, supplied 

 by Siemens Mros.. :!54 ; neutral 

 point in Charing Cross. 355 ; ob- 

 jections to, Preece's, W.. answered. 

 353-355 ; original arrangement of. 

 347 ; Postmaster (teneral, sub- 

 mitted to, some years previously 

 to application, 34(> ; reservoirs for 

 pressure and vacuum, 347 ; tubes. 

 fcc., laid by Aird & Co.. :;:. : 

 tubing, for cost of, 354 ; suitable 



I'UKSSl UK. 



for long distances and much 

 iratlie. 351. 350 : (tulii-x. c<,-\ n\ 

 lead, ton i^i-i-ai. proposal to tin 

 iron. 34S. :i:>:, friction in, IH'.i ; 

 olijretions to iron. 3JS ; rust in. 

 pii~>ible cause of, :!55 ; rusting 

 not orcurriiiir on the Continent, 

 355 :) uiiinterru[)ted use of at 

 Merlin for 12 years. :55:> ; working, 

 increased capacity of, 3 lit. 

 Pneumatic despatch, radial system, 

 319, 351 ; advocacy of by Pn err. 

 W. II., 353 ; impossibility of 

 laying pipes round centre. 351 ; 

 suitable for short distances and 

 light carriers and traffic 1 . 3."ii'>. 

 Pneumatic transmission, 34(!. 

 Pneumatic tubes, velocity of carriers 

 in. i!52 ; Montemps agreed with 

 F .mrier's theorem, 352. 

 Pouillet. computation by, of heat 

 radiated from s.in. 423 ; on sun's 

 temperature. I Ml" ('., l:i:>. 

 Power, transmission of, to distances. 

 :!*<: ; by air, 335 ; by electricity. 

 :>** ; by high-pressure mains, 388 ; 

 by hydraulic-pressure. 335 ; ma- 

 chinery for, 336 ; by wire ropes at 

 Schaffhausen, 388. 

 Pratt, Archdeacon, on terrestrial 



attraction. 372. 



I'rrrr,.. \V. II.. eiivuit system, ob- 

 jections to answered. 353-355 : 

 radial system, advocacy of, 353. 

 Pressure, high, vessels to resjsi. 

 Sicmens's. C. W., 38!) ; advanta-res 

 of over riveted boilei-s. 3!>2 : (/ij/- 

 I>lic(t1ile tn hydraulic cylinders 

 and accumulators, 31U : to marine 

 boilers. :i'.i2 :) J'eaumont, Col., 

 tramway locomotive engine. 3iKi. 

 31)1 ; bolts for. 3!H : carriage of 

 in pieces, 3DO, 3!i2 : east-iron for, 

 costly. 3S'.l : desrri[)t:on of. :\\\-> 

 flanges of. welding together. 395 : 

 galvanic action, prevention of. 

 :i'.i2 : groove.s for. 3!Hi. 3'J3 ; joints, 



