446 



INDEX TO VOLUME III. 



PHYSICAL KNOWLEDGE. 



Physical knowledge useful to artisan, 

 279. 



Physiological view of action of brain, 

 205. 



Picard, earth's radius, length of, 

 reference to paper by, 115. 



Pig metal run fused into Bessemer 

 converter, 139 ; advantages and 

 disadvantages of, 139. 



Piping in steel, removal of, 143. 



Pixii, magneto-electric current ap- 

 plied by, 395. 



Plante's secondary battery, 334, 410. 



Plants, growth of, 92 ; light con- 

 tinuously applied to, 272. 



Pneumatic despatch, 77 ; applied 

 first by Clark, L., since modified 

 and extended, 77. 



Polytechnic schools, 53, 273, 386. 



Polytechnic student, 274. 



Poole and Carpmael, Siemens, C. W., 

 visit to, 283. 



Postal telegraph department, im- 

 provements in, 177. 



Pot-au-feu, 361. 



Potential energy in nature, examples 

 of, 186. 



Pouillet, reference to, 210. 



Power transmission, illustrations of, 

 402, 403. 



Practical man, description of by 

 Bramwell, Sir F., 275 ; knowledge 

 that should be possessed by, 289. 



Practical processes, illustrations of, 

 289 ; not permanent, 289. 



Practitioner, " rule of thumb," 319. 



Preece, W. H. (electric light, danger 

 of, 237 ; consideration of subject, 

 238) ; on electricity in collieries, 

 237 ; telegraph department, statis- 

 tics of, supplied by, 177; tele- 

 graphy, lecture on, 391. 



Prescott, quadruplex telegraphy es- 

 tablished by, 168. 



Price's, and Siemens's, C. W.. original 

 retort gas producer, difference be- 

 tween and similarity of, 292. 



RADIANT ENERGY. 



Price's retort furnace, 110, 291 ; 

 Bell, I. L., on, reference to, 110 ; 

 " Engineering" letter to, on, 110. 



Priestley's balance, 118. 



Prime movers, Bramwell, F. J. ; ad- 

 dress on, reference to, 113. 



Prince Consort, Society of Arts, Past 

 President of, 367. 



Principles in physical science not 

 patentable, 166. 



Processes, 137. 



Professional training, only in work- 

 shop, office or field, 54. 



Progress in technical arts traceable 

 to Patent Office, 55 ; illustrations 

 of, 55. 



Puddled steel, definition of, 148. 



Puddling, Bell, I. L., researches on, 

 150 ; furnace, charging fluid metal 

 into, 150 ; (in gas furnaces, 155 ; 

 Coyte, A., on, 155 ; Nettlef old's 

 application of Siemens's, C. W., 

 history of, 155) ; Hamoir, researches 

 on, 150; (mechanical in rotating 

 chamber on horizontal axis, de- 

 veloped by Tooth. Yates, Mene- 

 laus, Banks, Spencer, Crampton, 

 Heath and Hopkins, Gilkes & Co., 

 149 ; difficulty in connection with, 

 149 ; Siemens, C. W., worked at 

 Towcesterand in Canada, 150 ; on 

 inclined axis, Maudsley, Alleyne 

 Sir J., and Pernot, 149 ; simple 

 finery process for, 150. 



QUADRUPLEX telegraphy, 168, 327. 



Quantity and quality of light im- 

 proved by application of regene- 

 rators, 252. 



Queen's speech, rate of transmission 

 of, 177. 



Quincke, G., dielectrics affected by 

 electrification, reference to, 353. 



RADIANT energy intercepted by 



