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Laboratory method of producing high potentials
820
CURRENT TOPICS.
[J. F. I.
Laboratory Method of Producing High Potentials. G. BREIT, M. A. TUVE AND O. DAHL. (Phys. Rev., Jan. I, 193o.) For the investigation of atomic structure and for the testing of theories it is desirable to have in the laboratory means of imparting high velocities to particles. The authors have designed a Tesla tube for this purpose. With the coils in oil and excited by 12o sparks per sec. a voltage of 3,000,000 is obtained. This is extended to 5,200,000 volts when the oil is under pressure. The use of the oil prevents both corona and sparking. For comparison with radioactive ~ources we recall that the number of a-particles emitted by a gram of radium per second is about' 3.5 x lO1°. Thus at 5,000,000 volts one spark a second has sufficient power to drive 0.75 x IOTM a-particles equivalent to 21 grams of radium, and I2O sparks a second would be equivalent to 2600 grams. Such a-particles would have an energy of IO,OOO,OOOelectron volts, at least 2,000,000 higher than the highest energy a-particles obtainable from radioactive sources." G. F. S. ERRATA.
THE DYNAMICAL THEORY OF ALTERNATING CURRENT MACHINERY AND THE PROBLEM OF THE STABILITY OF POWER SYSTEMS BY WYATT HAWKINS INGRAM,
S e p t e m b e r 193o, page 327 . P. 329, line 6, change n to 2n - I. line i, change n + I to 2n + I. line 7, change n to 2n. line 8, change " g e n e r a l i z e d " to " c a n n o n i c a l . " P. 336, eqn. (26), omit line under di. eqn. (27) should read: C1,C2 = K 4- 2.j ~ 4 / -4- 3,
C3,C4=K4-I. eqn. (28) change 2I eqn. (4x), change ¢ P. 340, line 12, change ~ to P. 34 I, line I3, change ¢ to line 2o, center is at
to 21. to % ¢. ¢.
(eo/2r).
CURRENT TOPICS.
[J. F. I.
Laboratory Method of Producing High Potentials. G. BREIT, M. A. TUVE AND O. DAHL. (Phys. Rev., Jan. I, 193o.) For the investigation of atomic structure and for the testing of theories it is desirable to have in the laboratory means of imparting high velocities to particles. The authors have designed a Tesla tube for this purpose. With the coils in oil and excited by 12o sparks per sec. a voltage of 3,000,000 is obtained. This is extended to 5,200,000 volts when the oil is under pressure. The use of the oil prevents both corona and sparking. For comparison with radioactive ~ources we recall that the number of a-particles emitted by a gram of radium per second is about' 3.5 x lO1°. Thus at 5,000,000 volts one spark a second has sufficient power to drive 0.75 x IOTM a-particles equivalent to 21 grams of radium, and I2O sparks a second would be equivalent to 2600 grams. Such a-particles would have an energy of IO,OOO,OOOelectron volts, at least 2,000,000 higher than the highest energy a-particles obtainable from radioactive sources." G. F. S. ERRATA.
THE DYNAMICAL THEORY OF ALTERNATING CURRENT MACHINERY AND THE PROBLEM OF THE STABILITY OF POWER SYSTEMS BY WYATT HAWKINS INGRAM,
S e p t e m b e r 193o, page 327 . P. 329, line 6, change n to 2n - I. line i, change n + I to 2n + I. line 7, change n to 2n. line 8, change " g e n e r a l i z e d " to " c a n n o n i c a l . " P. 336, eqn. (26), omit line under di. eqn. (27) should read: C1,C2 = K 4- 2.j ~ 4 / -4- 3,
C3,C4=K4-I. eqn. (28) change 2I eqn. (4x), change ¢ P. 340, line 12, change ~ to P. 34 I, line I3, change ¢ to line 2o, center is at
to 21. to % ¢. ¢.
(eo/2r).