952 
corrected for wave length from the data for various wave lengths of R&ntgen and 
Zehnder, assuming the difference due to wave length is independent of temperature. 
It was then corrected to the adiabatic coefficient from the data of Raman and 
Venkataraman, assuming again that the difference between the isothermal and adia- 
batic a is independent of temperature. The value of b was taken directly from the 
isothermal data of Poindexter and Rosen by interpolating for the proper wave length. 
It was assumed independent of temperature. The error in b can be of the order of 
30% and still make an error of only ca. 3% in the calculation of tha pressure in 
the range of pressure studied (ca. 17,0C0 1b/in.2). 
Table VII. Coefficients a and b in 
n(p) = ny = ap -bp~ for Pure Water 
t (°C) Wave Length a x 10° b x 106 Type of Source 
(A.U.) (per atm.) (per atm.) Pressure Change of Date* 
-0.78 5890 16.91 - Isothermal R and Z 
0.06 n 16.87 - n " 
0.42 " 16.78 - n f) 
1.05 a 16.68 z " n 
2.62 ud 16.51 Ei a n 
2.67 WY 16.52 = " f 
2.92 2 16.48 - " " 
3.10 " 16.44 = n a 
4.95 n 16.26 - 0 r) 
8.95 " 15.87 - n ® 
9.00 " 15.91 - r) a 
13.05 t) 15.56 - 8 " 
13.28 0 15.56 - " " 
17.83 " 15.26 - ® 8 
18.01 " 15.26 - " " 
18.03 n 15.25 - ® 8 
23.27 " 14.97 . ® 8 
23.1 " 14.98 - n R and V 
18.0 4861 15.40 - " R and Z 
18.0 6807 15.16 - n ® 
25.0 4,060 15.02 .003182 a P and R 
25.0 4360 14.65 2002700 ## z \ 
25.0 5460 4.75 003132 . , 
25.0 5790 14.56 2002990 . A 
23.1 5890 14. - Adiabatic R and V 
* Rand Z-W. C. Rontgen, and L. Zehnder, Ann.d. Physik (Wied.) 44, 24-51 (1891) 
,(low pressure study). 
R and V - Sir Venkata Raman, F.R.S., and K.S. Venkataraman, Proc. Roy, Soc. (London), 
171A, 137 (1939) (low pressure study). 
Band R - F. E. Poindexter and J. S. Rosen, Phys. Rev. (2), 45, 760(A) (1934) 
(pressures up to k800 kg/cm2). 
##* This datum seems out of line with the rest. 
The peak=pressure of the shock wave was then paleulated from several values of Pay 
in the following manner. The assumption was made that pay calculated from a given 
intersection of grid lines with a given value of r' was the pressure existing in 
the decaying spherical shock on a spherical surface of radius 
ii 
Tay" [RJ + (r Dr) ! 
