e seen small cameras. In fact, com- people attempt to economize by making a burner out While at present there are sections in the United paratively small ones are to be found upon the market. of gaspipe, but after sixteen years’ experience with States where crude oil is expensive and difficult to… … are 11%, inch by 1% inch by 1% inch, requires will require almost constant attention, in order to only a brief description, as it is merely a single keep the heat evenly distributed in the furnace, exposure camera, having few of the necessary and the result is unsatisfactory in both the quan-…
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