568 Mr. A. AVood on Spontaneous Ionization of 



Tin. 



1 



Unscreened. 



Screened. 



Unscreened. 



Screened. 



Unscreened. 



•561 

 •546 

 •529 

 •544 



Mean ...*545 



•443 

 •443 

 •425 

 •449 



•440 



•437 

 •485 

 •461 



•485 



•467 



■449 

 •437 

 •406 

 •425 



•429 



•518 

 •491 

 •491 

 •502 



•500 



Mean Ionization \ ~ nscieenec ... o Proportionate Diminution!^ percent. 



As the mean of the third set of observations was so 

 far from agreement with the means of the first and fifth, 

 and for another reason to which attention will be called 

 later, another series of readings was taken with the same 



vessel. 



Unscreened. 



Screened. 



Unscreened . 



Screened. 



Unscreened. 



•513 

 •546 

 •551 



•548 



Mean ...'539 



•496 

 •467 

 •461 

 •473 



•474 



•561 

 •516 



•529 

 561 



•549 



•496 

 •502 

 •496 

 •456 



•486 





Mean Ionizatio 



11 tScr 



Unscreened... '544 



sLLeeneu... <j-±± p r0 p 0r ti nate Diminution 11\ per cent. 

 Iron. 



Unscreened. 



Screened. 



Unscreened. 



Screened. 



Unscreened. 



•294 

 •298 

 •333 

 •312 



Mean ...'309 



•222 -276 

 •23S -261 

 •222 -270 

 •222 | -291 



•226 -274 



•238 

 •238 

 •214 

 •214 



•226 



•284 

 •319 

 •319 

 •325 



•312 



Mean Ionization j ^^nTd 6 ^ ' ' '226 Pro P ortionate Diminution U per cent, 





Aluminium. 







Unscreened. 



Screened. 



Unscreened. 



Screened. 



Unscreened. 



•276 

 •291 

 •304 

 •291 



Mean ...'290 



•261 

 •276 

 •271 

 •264 



•268 



•291 

 •304 

 •291 

 •246 



•283 



•230 

 •206 

 •217 

 •222 



•219 





Mean Ionization 



[Unscreened... "287 

 1 Screened -243 



Proportionate Diminution 15 percent. 



