472 C. FE. Fritts—New Form of Selenium Cell. : 
TABLE A. 
SELENIUM CELL, TESTED BY DR. WERNER SIEMENS. 
Selenium in Relative Conductivities. Resistance in Ohms. Fs 
Deflection. | Ratio. 
fie a dicgh ete pats 32° ee 10,070,000 
“i Diffnaod daylight_ 110° 34 2, '930, 000 
ge Seaueds 180° 5°6 qy cae 000 
WHUDNG os scus 470° 14°8 ,000 
TABLE B. 
SELENIUM CELL, TESTED BY THE AUTHOR. 
esistance in Ohms. 
| Test | Test fig! Test Test | Test | Test 
Brass Cell, No. 16. | xo°1,| No 2 No. 4. | No. 6. | No. 6.| No. 7. 
Dark | 210° | 210°. Tae 110° an 219° Sot 
Diffused daylight _.| 49° | 14: | 53- | 13: | 110° | 90° 
Per cent of change.| 766] 93:3| 688] 881| 47-6! 58-9 ai 
__ Note-—A_ paper on “The Action of Light on Selenium,” by 
Baresi W. G. Adams, F.R.S., and Mr. R. E. Day, in Proc. 
Roy. Soc., vol. xxv, p. 118, contains the following statements : 
st. That on reversing the direction of the current through 
selenium the “resistance was always found to be different from 
that previously obtained.” As I have shown, the resistance is 
not a were ifferent. 
2d. ‘The first current through the selenium, if a strong one, 
causes a permanent ‘set’ of the molecules, in’ consequence 0 
which the passage of the current during the remainder of the 
experiments is more resisted in that direction than it is when 
alrea 
times in the opposite direction, sometimes there is no get” 
at all, and in two cases the “set” changed and was reversed 
during the yhared a aig of the cells. 
3d. 
site occurs in other cases, and in still other instances the in- 
crease or a . resistance stops at a certain battery poweh 
and is then rev 
It will be seen 7 that their experiments and results were eD- 
tirely different from mine, except on the three foregoing points. 
As to them, so far as the above quotations agree with my 
. 
salts, eas investigators are entitled to the credit of first — 
1SCco : 
ver 
New York City, Aug. 28, 1883. 
