t by lost, in consequence of the air becoming cooled before open them and the springs whichtry to close them. pulling on a rearwardly extending cord a downward use. The purpose of the compound system is to di- The action of the mechanical gear is to retract the swinging motion is given to one of… … ready attachment to ing, and the total num- the main runners of ber of valves is, conse- different forms of auxil- quently, very largely re- duced. The machineis also fitted with the Rand Drill hard frozen ground or loose or wet snow. its original temperature by means ofa water jacket, Company’s…
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