386 Scientific Intelligence. 
tric lamp, provided with carbons of one-half inch square section 
and run at different by means of a or , was 
compared, under varied circumstances of work and resistance of 
circuit, with a parafine eflected light was carefully shut 
compared according to the method of Roscoe. It was found that 
the brightness, or intensity, as well as the actinic effect, increased 
in a greater ratio than the number of revolutions of the generator 
and the horse power consumed. ‘The increase was slower for the 
rays, quicker for the blue and quickest for the actinic effect. 
The following table exhibits this result: 
No. of Horse 
revolutions. power. Blue light. Red light. Actinic effect. 
240 1°6 360 candles. 180 candles. .--.- 
350 2°5 Zoo. oes 890 candles. 
460 5°6 2500; © 860 750° = 
540 sre 6500. “ 1670. ee 
565 9°0 hoes 2100 $6 71020°"* 
580 os See, ore aoa 
The resistance of the voltaic are was about 0°18 of an ohm 
with 375 to 3883 revolutions per minute; the electromotive 
power of the machine was 111 volts. The resistance of the cir- 
cuit was about 0°5 of an ohm.—Proc. Roy. Soc., xxvii, 157-166, 
1878; Beiblitter Physik und Chemie, ii, 497. J. T. 
A new Electric Lamp.—M. G. Reynrer describes in the 
da lig 
to have produced several lights in the same circuit. J. T. 
13. The strength of the Electric Telephonic Currents.— BosscHa 
microscope which permitted of a movement of a thousandth of a 
millimeter (mikron 4). Movements of 5°77 to 7°77 mikron indi- 
cated in one telephone (numbered 3) currents of 071627 and 0°2337 
With three other telephones numbered 1, 2 and 4, ¢ had the 
values &=22°5u, é=8°74 and 35°94. In order to ascertain the 
a : 
Bon ee a he ee ee E 
