488 ISOTOPIC TRACERS AND NUCLEAR RADIATIONS [Chap. 21 



modulation up to 30 per cent [14—16]. In all cases variable capacitors 

 were used. 



REFERENCES FOR CHAP. 21 



1. Lawrence, E. O., and M. S. Livingston: Phys. Rev., 40, 19 (1932). 



2. Skaggs, L. S., G. M. Almy, D. W. Kerst, and L. H. Lanzl: Phys. Rev., 70, 95 (1946). 



3. Wilson, R. R., and Mr. Kamen: Phys. Rev., 54, 1031 (1938). 



4. Reid, A. F.: Rev. Set. Instruments, 18, 501 (1947). 



5. Weil, A. S., A. F. Reid, and J. R. Dunning: Rev. Sci. Instruments, 18, 556 (1947). 



6. Crocker Laboratory, University of California. 



7. Hull and Williams: Rev. Sci. Instruments, 11, 299 (1940). 



8. Irvine, J.: Phys. Chem., 46, 910 (1942). 



9. Rose, M. E.: Phys. Rev., 53, 392 (1937). 



10. McMillan, E.: Phys. Rev., 68, 143 (1945). 



11. Veksler, V.: /. Phys. (U.S.S.R.), 9, 153 (1945). 



12. Schtff, L. L.: Rev. Sci. Instruments, 17, 6 (1946). 



13. Bohn, D., and L. Foldy: Phys. Rev., 70, 249 (1946). 



14. Richardson, J. R., ct al.: Phys. Rev., 69, 669 (1946). 



15. Brobeck, W. M., ct al.-.Phys. Rev., 71, 449 (1947). 



16. Schmidt, F. H: Rev. Sci. Instruments, 17, 301 (1946). 



17. Richardson, J. R., B. T. Wright, E. J. Lofgren, and B. Peters: Phys. Rev., 73, 424 

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