ibrating balance me- An adjustable tension, with sufficient power for springs The latter moves by its own gravity on rails slightly in- for folding or cabinet bedsteads, is secured by a spring chanism clined in opposite directions (see Fig. 3), so that when Mr. Gorham N. Winslow, box 290, Newton,… … and similar materials from a loose con- termittent rotary motion. The driv- dition into hard rolls, especially ma- DREW'S MECHANICAL MOVEMENT. ing shaft carries a triple sprocket terials of a brittle nature—such as, for wheel, which is keyed on or otherwise fastened, and the driven shaft has three…
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