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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
ts, and having a projection at one end forming a bolster; each compartment has a valve through which it is inflated by a bellows. Aircushions are merely small sacks filled with air through a tube at one co2ner or end, by means of an air-condenser or by expiration from the lungs: escape is prevented by a screw-stopcock. These articles are useful to travellers and invalids, being light and elastic, but are liable to be torn or punctured, and thus rendered worthless. Linden's air-bed. linden, October 7, 1862, has adapted the elastic bed to be used as a part of the infantry equipment. The air-bed has an outside flap of enamelled cloth or leather, cut longer and wider than the bed so as to form a coverlid for the person who lies upon the inflated bed. When the bed is collapsed it can be folded in such a manner as to form a knapsack, and is provided with straps to enable it to be worn as such when on the march. Hamilton, July 16, 1867, ties the upper and lower surfaces of the b