ater designed to collect the steam, and the space between to grinding-wheels, whereby many objections hitherto the inner and outer shells being filled with water. A NEW WAY OF CONSTRUCTING DRAWBRIDGES, encountered are overcome. When heat is applied to the outer cylinder, the bottom- In drawbridges… … jar. When the fire decreases in intensity, the interior shown in Fig. 3. Locking bolts engage the heels and cylinder becomes partly filled with water; when the the floors of the spans, and a second set of bolts con- heat is at its maximum temperature, the water isforced nected with the first-named…
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