d at certain inter-vals, by the revolution of a cam or wheel, andthe planting is not therefore under the controlof the operator. This machine is very light, simple, cheap,durable, and serviceable. By its use one manwith ahorse can plant from 10 to 20 acres perday with ease, so we are told. Single… … Steam Boiler Indicator. Many of the safety indicators and explosionpreventors used on steam boilers depend fortheir operation upon a float resting upon thesurface of the water within the boiler. Whenthe water sinks below a certain level the floatis expected to follow, and pull down the leverto…
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