The Monthly Magazine, Volume 41Sherwood, Gilbert and Piper, 1816 |
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Page 34
... light in most coal - pits , to the lowest possible limit . Accordingly , in many pits , only a few of the most frequented gates , or pas- sages , near to the working shaft , have any fixed lamps or constant light ; the boys , called ...
... light in most coal - pits , to the lowest possible limit . Accordingly , in many pits , only a few of the most frequented gates , or pas- sages , near to the working shaft , have any fixed lamps or constant light ; the boys , called ...
Page 47
Proceedings of Public Societies . I have occasionally availed myself of the light of concave. 1816. ] A very material inconvenience is that mirrors , which must be large in order to grasp much light , must also be of a great focal length ...
Proceedings of Public Societies . I have occasionally availed myself of the light of concave. 1816. ] A very material inconvenience is that mirrors , which must be large in order to grasp much light , must also be of a great focal length ...
Page 151
... light is much increased by hanging within , from the top of the cylinder , a small cage of platina or iron wire ; this becomes ignited by the flame , and gives a steady red light in the midst of it ; and he has never had an explosion in ...
... light is much increased by hanging within , from the top of the cylinder , a small cage of platina or iron wire ; this becomes ignited by the flame , and gives a steady red light in the midst of it ; and he has never had an explosion in ...
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