[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 306
To increase thestrength of the field make a core out of a piece ofsoft bar iron, which will go inside the coil andallow it to move freely. You will need a smallmirror to attach to the coil. This can be made,but it is much better to buy it of a dealer ininstrument supplies. The glass must be very… … Figure 7. Fasten the magnet to your base-board by meansof brass angles. On the under side of the boardcut out a place for the tension spring, which mustbe fastened to the board at one end, and at theother have a hook to engage with that on the coil.A small screw passing through the board and KECENT…
Electricity
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