Easy Electrical Experiments and How to Make Them: An Elementary Hand-Book of Lessons, Experiments and Inventions for Beginners as Well as Advanced ... Easily Understood Language (Classic Reprint) - Tapa dura

Sinopsis

Excerpt from Easy Electrical Experiments and How to Make Them: An Elementary Hand-Book of Lessons, Experiments and Inventions for Beginners as Well as Advanced Students, Written in a Simple and Easily Understood Language

Cut a piece Of board three inches square and inch thick. In the center bore a 34-inch hole; from the center Of this hole bore four other holes in diameter and equally spaced around the 'central. Hole. (see Fig. I.) File every trace Of cop per from the surface of the carbon rods (if they are copper plated) and having filed them to a length of 5 inches, push four of them through the holes so that they project 3% inches from the lower side Of the board. They Should fit snugly, and be wedged in if necessary.

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