P

Pacific Gas & Electric (PG&E), 115 –6

Particle accelerator, 49 –51, 53 , 59 , 77 , 80 , 89 , 91 , 116 , 127 , 132 , 147 , 150 , 162 , 196 ;

Cockcroft and Walton's, 68 –9;

Lauritsen's discharge tube, 52 –4;

Van de Graaff's elec-

trostatic generator, 60 –3;

Wideroe's version of, 77 –8

Patents, 104 –6, 110 , 112 , 123 , 192 –3, 195 –6, 199

Paxton, Hugh, 232 , 376 , 470

Peierls, Rudolph, 506

Pelton, Lester Allen, 5 –6

Philips of Eindhoven, 325 –7

Phillips, Melba, 87 , 173

Photosynthesis, 408 –13

Plutonium, 412 , 461 –2, 512 –3

Poillon, Howard A., 104 , 123 , 195 , 197 , 217 , 391 , 395 , 404 , 482

Pollard, Ernest, 411

Posin, Daniel, 232

Poulsen, Vladimir, 10

Poulsen generator, 130 , 134

Poulsen magnet, 266 , 269 , 318

Princeton University, 36 , 60 , 263 , 264 , 302 , 322 , 323 , 369 , 516

Proton, 422

Purdue University, 290 –1, 309