260 REPORTS ON THE STATE OF SCIENCE. 
1S 
hee Spectrum | Spark Speckenma | Reduction to 
Sie ta = a eal ee | = Vacuum 
Wane: length | Inten- | Wave- taten-| ‘Oscillation 
—s : os | sity length sity | Frequency, 
| Hovland | wxner and | and | 1 in Vacuo | 
Kayser | and | and | Cha- Exner and) Cha- = a+ | ~— 
| Tatnall | Haschek | Facter | Haschek | racter | a 
2647-07 1 0-76 11 ‘0 37767°5 
2644-2 l i: » | 37808- 
2643-691 43-68 2 RS be 15-0 
43-077 43:10 | 3 a 3 23:5 
42°857 0 42°8 4 ” ” 26°38 | 
41-7 4 ” = 43° 
40°6 2n As » 59- 
39°'8 1 7 ” 71: 
39°327 0 ” ” 17-4 
39°2b | 4 , ae 79: 
39-097 0 2 . 80°7 
38839 38-84 | 2 38:8 4 i Pea 84-4 
38-388 38:39 0 a mal 90-9 
37-484 0 ; s 37903-9 
| 37-0 In _ J 1i-~ | 
36-744 l BS aloe 14-6 | 
36°5 l 53 mi 18- 
35:40 1 ; : 33-9 
35°3b 6 oe x 35° 
35-082 35:07 3 és Ss 38:6 
34-605 | | oO 34-6 4 7 | 45-4 
| 33-523 | 33°50 2 =: a eee: br 
| 33378 | 33-40 | 2 334 |1 % > | 0) pee 
| | 32-7 1 aia oh age | 
| 31:3 | 1 igs es 79° 
30-509 | 30-49 2 - 1l-1 | 38004-4 | 
| Maysbel is | He eal ee o7- | 
| 80-003 | 30:00 2 11-7 | 
| 28-222 | |" 28-22?) 70 28-2b 8 af < 37-4 | 
| | . 27:9 | 2 ” ” 42- | 
27-042 | 0 " : BAD 
26-776 | |) Sera ee 26-7 4 . a) 58-4 | 
25-973 | | 26:00) 3 260 | 1 Fe - 69-9 
25-496 | | 2651] 1 25:5b 8 : és 76°8 
25-309 25°33 | 2 33 ns 79°5 | 
24-948 | | 2496 | 0 a “ 84:8 | 
24-821 | | O 24-8 2 5 an 86°7 
22:756 | 2-70 | 1 53 35 | SBI L | 
22-661 | 4 22-6 2 - af 181 | 
| 21-2 I 2 ; 39° 
21-099 | PVR | ts mn 40°7 
| 200 | 1 = - br | 
19-0 1 > ie | 71- | 
18-596 18-61 3 Los: “s 77-2 | 
| 178 In . a | 89- 
| | 17-1 l ss a 99 
| 16-178 | 1617. 2 yi | 288212-7 
| 16-0 l e % 15° 
ID eon | 15°74 2 ” ” 19-0 
| 15-4" 1 ” ” 24° 
14-7 1 > i 34: 
13°8 ioe bg AT | 
13-689 13-70 4n 13-6 a i as 48-9 | 
| 13°145 | eisai 0. | | ex a 
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