on and contraction of the spiral spring, G, and the needle, H. At H is also a ends of the sheets permit considerable expansion and sheets by the changes of temperature. If a roof is plug, or guide, screwed to the inside of the chamber, covered in the spring, the heats of summer will ex- J'r'tr -2-… … roof is at all times assured. is thus opened and the cartridge can be intro- An application for a patent is now pending, and duced. But the cold of winter does not, on the other hand, for further information address Ed. Becker, 347 Cen- The chamber is then moved forward and locked restore the…
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