964 
EEV. T. E. EOBINSON ON SPECTEA OE ELECTEIC LIGHT, 
Table XII. — Bismuth. 
I have given N, C.P., at the negative boundary in part. It seemed identical with the 
central one till No. 20 ; so I did not take that part. In the green the lustre of the lines 
marked b. or vb. is fully that of 0, and they would be marked # if they were as wide as 
the sht. In the indigo and violet this spectrum has little, if any, superiority of bright- 
ness. In air, C.P., No. 20 is the brightest of the whole, and the companion of ri is deve- 
loped into first-rate brightness. In air, R., there is no red but the single line No. 7. 
