. . . | 8 to 13 | Marks |
| Magnesium light . . . | 12.5 | Rogers |
| Acetylene . . . . | 10.5 | Stewart and Hoxie |
| " (No. 0 slit burner | 11.35 | Neuberg |
| " (No. 00000 . . | | |
| Bray fishtail) | 13.8 | Neuberg |
| " (No. 3 duplex) . | 14.7 | Neuberg |
| Geissler tube . . . | 32.0 | Staub |
|____________________________|___________________|___________________|
Violle and Fery, also Erdmann, have proposed the use of acetylene as a
standard of light. As a standard burner Fery employed a piece of
thermometer tube, cut off smoothly at the end and having a diameter of
0.5 millimetre, a variation in the diameter up to 10 per cent. being of
no consequence. When the height of the flame ranged from 10 to 25
millimetres the burner passed from 2.02 to 4.28 litres per hour, and the
illuminating power of the light remained sensibly proportional to the
height of the jet, with maximum variations from the calculated value of
+-0.
Pages:
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425