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Page 34
Accordingly, in many pits, only a few of the most frequented gates, or passages,
near to the working shaft, have any fixed lamps or constant light; the boys, called
trappers, stationed to open and shut the air-doors, when men or train-waggons ...
Accordingly, in many pits, only a few of the most frequented gates, or passages,
near to the working shaft, have any fixed lamps or constant light; the boys, called
trappers, stationed to open and shut the air-doors, when men or train-waggons ...
Page 47
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; and that in consequence of
this, we must submit to be incumbered with a large apparatus, which will require
an ...
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; and that in consequence of
this, we must submit to be incumbered with a large apparatus, which will require
an ...
Page 497
the first part of the Royal Institution's Journal of Science and the Arts, Sir H. DAVY
inserted a short paper on the wire-gauze safe-lamps for preventing explosions
from fire-damp, and for giving light in explosive atmospheres in coal-mines.
the first part of the Royal Institution's Journal of Science and the Arts, Sir H. DAVY
inserted a short paper on the wire-gauze safe-lamps for preventing explosions
from fire-damp, and for giving light in explosive atmospheres in coal-mines.
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