he top is hermeti- +O —__—— cally sealed by the cover, ¢, a central orificein which serves WESTON’S LIGHTNING ROD DISCHARGING POINT. for the introduction of the lubricant (melted tallow), being In order to render lightning rods of any efficacy asa pro- closed by the screw, f. The receptacle, b, is… … at each change of stroke, a drop of tallowescapes at d, being to exist. ground terminals shall be large, and sufficiently so to dis- The Centennial Committee and others can, for further forced down by the steam above. The apparatus is thus charge all the electricity from therod. The object of the…
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