torch (Fig. 9), the Invincible (Fig. 10), and the Etna, which differin the method of producing theblast Barthels patent automaticis also a useful pattern. The latest lamp is the Ridgelv,of which I illustrate a sectionshowing the valve, which will notjam, and the automatic pump.This lamp is… … Fig. 10a.- -The Ridgelv blowlamp. PLANT AND APPLIANCES. 47 them with,screw. The pump valve is automatic, requiring no set
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