oduction of the held with one hand, and the cap rotated backward improved method shown in our illustration, which for the discharge of steam in the firebox and under the and forward with the thumb and finger of the grate to promote perfect combustion and insure a very high temperature. This… … the stem escapes, insuring the best results and FURNACE. a perfect, clear, and loud tone. The bell can Although only one furnace is shown, any number of be raised and lowered to suit the steam pressure by has been adopted at the Giant Powder Works, Hopat- ireboxes may be arranged side by side in…
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