this experiment, instead of only proper method is by diagrams. Sweep a clean place on havinga straw for an index, I use a beam of light. You will the light is lowered. Now, ifI shorten the length of wire a smooth floor and set out with chalk line and “tram” two understand the apparatus when I make… … of brass, , and here is another, p’; andstretching across from accurately as possible, or lay them down on paper to a suita- through the main center of the working beam. Now, it is support to support are two bars, one of brass and one of iron. ble‘scale. Notice that a belt to work at quarter twist…
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