84 



Prof. J. A. Fleming on the 



§ 17. The question remained to be settled whether the 

 nature of the tubular screen in any way affected the results, 

 and the glass tube was accordingly replaced by a metal 

 (aluminium) tube and a lamp (No. 10) taken in which one of 



Tables No. 12 and 13.— Curve No. 6. 



O 



4-o ■ 



3-5 I 



3-0 | " 



-if 



20 « 



vi 1 — 



lo IE 



.5 ;j 



IB IBBBBBfl 



nunann 



aBBBI III |l' Will 



36 38 40 42 44 46 48 

 Working Volts of Lamp. 



50 52 



54 



the carbon legs (see fig. 14) was surrounded by an aluminium 

 cylinder extending nearly the whole length of the leg, and 

 also a middle plate of aluminium was placed between the 

 legs. Both the plate and the cylinder were held on platinum 

 wires sealed through the glass. The lamp took 1*25 amperes 

 of current at 41*5 volts. 



