_
________________________________________________________
| | | | | |
| Mantle. | New. | After | After | After |
| | | 100 Hours. | 200 Hours. | 400 Hours. |
|_________|_______|____________|____________|____________|
| | | | | |
| No. 1. | 53.2 | 51.8 | 50.6 | 49.8 |
| No. 2. | 76.3 | 75.8 | 73.4 | 72.2 |
| No. 3. | 73.1 | 72.5 | 70.1 | 68.6 |
|_________|_______|____________|____________|____________|
It will be seen that the maximum loss of illuminating power in 400 hours
was 6.4 per cent., the average loss being 6.0 per cent.
TYPICAL INCANDESCENT BURNERS.--Of the many burners for lighting by the
use of incandescent mantles which have been devised, a few of the more
widely used types may be briefly referred to. There is no doubt that
finality in the design of these burners has not yet been reached, and
that improvements in the direction of simplification of construction and
in efficiency and durability will continue to be made.
Among the early incandescent burners, one made by the Allgemeine Carbid
und Acetylen Gesellschaft of Berlin in 1900 depended on the narrowness of
the mixing tube and the proportioning of the gas nipple and air inlets to
prevent lighting-back.
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