VISIBLE AND NEAR-VISIBLE RADIATION 185 



Table 16. — Monochromator MEAStTREMENTs of High- and Low-intenbity Arcs 



Wave- 

 length, 



A 



Galvanometer 

 reading, mm. 



High int. 



2.7 

 0.9 



161 



130 

 4.5 



106 



62 

 2.6 

 183 



16 



110 

 57 



29.5 



4.0 



10.7 



Low int. 



0.06 

 0.03 

 3.73 

 9.05 



03 



7.90 

 4.80 

 0.04 

 5.50 

 0.36 



5.10 



1 16 

 1.05 

 0.11 

 0.33 



Absolute intensity 250 mm. from 



a 20-mm. midsection of the arc, 



fxw./cm..- 



6908 

 6234 



5780 

 5461 

 4916 



4358 

 4047 

 3906 

 3654 

 3341 



3130 

 3022 

 2967 

 2925 

 2894 



2804 

 2752 

 2699 

 2652 

 2602 



2576 

 2536 

 2483 

 2463 

 2447 

 2399 



2378 

 2352 

 2323 

 2300 

 2283 

 2250 



Total for 143.5 volts 



Total corrected to 150 volts 



Total less than and including \ 3.130 



for 143.5 volts 



Total less than and including X 3,130 



(corrected to 150 volts) 



High int. 



7.5 

 2.6 



468 



384 

 13.5 



327 

 195 



8.2 

 585 

 52 



359 



187 

 97.1 

 13.2 

 35.4 



3 , 302 3 

 3.450 



1,303 



1,362 



High int. 

 new arc 



473 

 384 



353 

 204 



643 

 54 



377 

 194 

 95.1 



34.7 



71.7 



130 



154 

 48.6 



23.3 



22.6 

 16.7 



Low int. 



0.17 



0.09 



10.85 



26.70 



0.09 



24.40 



15.10 



0.13 



17.60 



1.17 



16.70 

 3.82 

 3.46 

 0.36 

 1.09 



147.3 



51.0 



Amount excluded by 



barium Hint and 



transmitted by quartz 



water cell, ^w./cm.* 



High int. 



0.0 

 0.0 

 0.0 

 0.0 







0.0 

 1.5 

 0.1 

 17.6 

 3.4 



321 



168 

 86 5 

 11.6 

 31.2 



65.9 



20.6 



28.1 



121 



7.8 



14.7 

 136 



37.8 

 5.0 

 4.3 



13.6 



11.0 

 9.6 

 3. 

 2. 

 1. 

 1. 



126 

 180 



Low int. 



0.0 

 0.0 

 0.0 

 0.0 

 0.0 



0.0 



0.12 



0.00 



0.53 



0.47 



14.92 

 3.44 

 3.08 

 0.32 

 0.96 



1.29 

 0.53 

 0.48 

 2.56 

 0.12 



19 

 12.30 

 1.05 

 0.15 

 0.07 

 0.33 



25 

 15 

 0.06 

 0.12 

 08 



43 6 



For "total arc" multiply all values by 7.1 



