Electronic crystal clock

1973 ◽  
Vol 16 (10) ◽  
pp. 1585-1586
Author(s):  
S. A. �l'kin ◽  
V. M. Petrov

1947 ◽  
Vol 244 (4) ◽  
pp. 322
Author(s):  
RHO


1947 ◽  
Vol 66 (4) ◽  
pp. 380-380


Science ◽  
1929 ◽  
Vol 70 (1809) ◽  
pp. xii-xii
Keyword(s):  


2010 ◽  
Vol 7 (3) ◽  
pp. 190-191 ◽  
Author(s):  
Timm Schroeder


1973 ◽  
Vol 26 (3) ◽  
pp. 294-300
Author(s):  
Junzo KASAHARA ◽  
Toru OUCHI ◽  
Masumi YANAGISAWA ◽  
Shozaburo NAGUMO


1949 ◽  
Vol 27f (12) ◽  
pp. 470-478 ◽  
Author(s):  
V. E. Hollinsworth

Making use of the quartz frequency standard of the Dominion Observatory crystal clock an electronic frequency converter has been constructed that transforms the 50,000 cycle output of the crystal to a frequency of 60 cycles. Suitable amplification makes possible sufficient power for operating several standard 60 cycle motors and these are being used to drive printing and drum chronographs and for the operation of other types of recorders.





1970 ◽  
Vol 48 (13) ◽  
pp. 1578-1584 ◽  
Author(s):  
P. J. Scanlon ◽  
D. Crabtree

The half-life values for the β+ emitters 29P and 33Cl reported in the literature show a wide variation (4.6 ± 0.2 to 4.19 ± 0.02 s for 29P and 2.9 ± 0.1 to 2.51 ± 0.02 s for 33Cl). We have remeasured these activities via the Si(p,γ)P and S(p,γ)Cl reactions with protons from a 3 MV Van de Graaff. The decay positrons were detected in a solid-state detector telescope and the time distribution of the pulses was determined with a multiscaler controlled by a crystal clock. Data were analyzed by an iterative least-squares procedure and by the Fourier transform method. Values obtained were 4.15 ± 0.03 s for 29P and 2.47 ± 0.02 s for 33Cl.



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