ltered. the tubes, have been used for years, but they cannot The annexed engraving represents a head or clamp be employed unless the boiler is quite cold, otherwise for house brooms; it is made of malleable iron in BIRD’S GEARED DIFFERENTIAL PULLEY. they will be destroyed. Steel-wire brushes have… … A, having a sharp-threaded screw on the inside to receive the handle; the other piece is made with a yoke or ring, B, which passes over the socket. The handle is made a little tapering and pointed at the The engraving published herewii 1 shows an im- end. By inserting it, when the clamp is closed,…
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