Insulating materials : vulcabeston controller parts, field spools, bushings, etc. ... (1894)
H. W. Johns Mfg. Co. · H. W. Johns Mfg. Co. · leaf 4
No. 52, Complete, for oB.&S., with hinged ear No. 602.. 90c.No. 55, Iron Clad Bell, alone 40c. H. W. Johns Manufacturing Co. LINE INSULATOR.•ROUND TOP MANGER. … An exceedingly strong form of insulator in metal shell,which thoroughly protects the Moulded Mica insulation fromblows of the trolley wheel. The screw stud is % inch steel. This insulator is a standard and has been largely used byprominent street railway companies aud engineers.
Electricity · Electrical utilities · Insulators
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![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-233-98.webp)
