[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 315
dle is shown in Fig. 13. This cover slides in grooves in the rear of thebox. It has mounted on it a brass pillar with ahole drilled through its centre and carrying a plugat the top, with a milled head, upon which the fibre KECENT APPLICATIONS. S13 is wound. This fibre passes down through themiddle… … M*g> Figure 13, and harden and magnetize them strongly. Thrustthem through a piece of elder pith parallel to eachother, as shown above, being careful to have thesame poles point the same way. The pointer is to be made of two pieces of splitstraw, stuck together at one end and bound to £piece of…
Electricity
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