Trebel, George. [from old catalog] · New York, F. Tousey · leaf 64
Great care must be taken to have all wires and connectionsproperly insulated, and you will find that many a failure isreferable to the neglect of this precaution. All materal usedshould be dn/and clean-, dirt and moisture are good conduct-ors. If you arc unable to make one part of an apparatus,… … cheap, and with a little ingenuity combined with directionsfound in these articles, you will be enabled to make, in mini-ature, almost any instrument now in use. I would, however,caution all to be careful with the acid mentioned in connect-ion with batteries. Should any of it be spilled on clothes,…
Electricity
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