ed upon its which the air pump is connected) on the end of it. ing two divergent plates secured to arock-bar. To the When used in libraries, schoolhouses, and office grating, water is poured into the outer casing to a cer- upper end of this gate-post a segment-rack is secured buildings, the air… … small quantity of carbide is made to touch a very large AUTOMATIC GATE-FASTENER. A SIMPLE PRESSURE REGULATOR. sheet of water. The gas generated is therefore cool. It will be furthermore observed that the carbide is not :pper end of the rock-bar is a latch-lever adapted to long felt ; for it reduces…
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