p]LECTRIC DISCHARGES IN GASES AT LOW PRESSURES. 
40!) 
Table I. —Air. 
Spark length 
= 1 millim. 
Spark length 
= 2 millims. 
1 
Spark length 
= 3 millims. 
Spark length 
= 5 millims. 
Spark length 
= 10 millims. 
Pressures 
f in 
! millims. 
of 
mercury. 
Spark 
potential 
in 
volts. 
Pressures 
in 
millims. 
of 
mercury. 
Spark 
potential 
in 
volts. 
' Pressures 
in 
millims. 
of 
mercury. 
Spark 
potential 
in 
volts. 
Pressures 
in 
millims. 
of 
* mercury. 
Spark 
potential 
in 
volts. 
Pressures 
in 
millims. 
of 
mercury. 
1 
Spark 
potential 
in 
volts. 
150 
' 1510 
20 
1 
620 
51 
1480 
7-34 
! 
' 600 
7-09 
! 
I 831 
1 120 
1265 
13-2 
527 
41-5 
1275 
4-61 
504 
4-12 
645 
90 
1025 
8-73 
455 
31-5 
1015 
2-95 
418 
2-39 
504 
61 
784 
5-52 
400 
21-4 
790 
1-85 
368 
1-39 
420 
40-8 
634 
4-11 
373 
14-1 
630 
1-57 
356 
•982 
372 
‘ 21-6 
489 
3-16 
355 
9-31 
526 
1-34 
349 
•805 
355 
19-4 
477 
2-71 
351 
5-99 
452 
1-14 
352 
•679 
348 
12-4 
417 
2-32 
357 
3-84 
405 
•982 
359 
•562 
351 
7-77 
367 
2-02 
371 
2-51 
371 
•839 
370 
•466 
359 
6-66 
357 
1-75 
389 
2-18 
361 
•714 
388 
•384 
377 
5-80 
352 
1-52 
419 
1-89 
356 
•607 
427 
•312 
425 
4-98 
349 
1 -30 
460 
1-64 
358 
•517 
484 
•259 
504 
4-27 
355 
1-13 
534 
1-42 
364 
•440 
575 
•219 
605 
3-67 
368 
•982 
654 
1-22 
375 
•375 
705 
•180 
757 
1 3‘15 
392 
•857 
826 1 
1-06 
397 
•321 
935 
•152 
1020 
2-70 
429 
•750 
1042 
•928 
441 
•276 
1223 
•125 
1315 
2-35 
481 
•643 
1312 
•804 
494 
•232 
1585 
•105 
1730 
2-02 
558 
•549 
1695 
•710 
576 1 
•216 
1774 
— 
— 
1-74 
681 
•536 
1829 
•616 
691 
_ 
_ 
_ 
1-51 
855 
— 
1 
•536 
863 
_ 
_ 
- 
_ 
1-29 
1090 
— 
•465 
1092 
_ 
_ 
1-12 
1463 
— 
1 
•411 
1395 
_ 
_ 
_ 
1-05 
1826 
1 
— 
— 
•357 
1786 
1 
— 
— 
— 
