[Bubier], Edward Trevert, 1858- [from old catalog] · Lynn, Mass., Bubier pub. co. · leaf 317
he endof the pointer is over the scale block. Of courselooking down on it you see only the edge whichenables you to take a very fine reading. RECENT APPLICATIONS. 315 The box itself must be mounted, as shown, on ablock at one end, and a brass rod at the other, andmust be at such a height that when… … Figure 14. with a set screw. This magnet must be made ofthe best steel and glass hard. It should bemagnetized rather strongly and then aged bytapping it and immersing it for some hours inboiling water. This will reduce its strength butmake it constant. The scale is marked off intangents. This means…
Electricity
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