. The Country gentleman's magazine. Agriculture; Agriculture -- Great Britain. F,g. 14. common one is shewn in fig. 14, where the rod a a is connected with a float which rises or falls with the varying level of the water in the boiler. This is connected at its upper end with a chain which passes over a wheel b, and is supplied at its other extremity with a counterpoise weight c. As the wheel moves partially round, its index or finger point d shews how the water level is in the boiler. This apparatus, however simple, is not to be relied upon at all times, as the rod is apt to stick in the stufi
. The Country gentleman's magazine. Agriculture; Agriculture -- Great Britain. F,g. 14. common one is shewn in fig. 14, where the rod a a is connected with a float which rises or falls with the varying level of the water in the boiler. This is connected at its upper end with a chain which passes over a wheel b, and is supplied at its other extremity with a counterpoise weight c. As the wheel moves partially round, its index or finger point d shews how the water level is in the boiler. This apparatus, however simple, is not to be relied upon at all times, as the rod is apt to stick in the stufiing-box e. We know of no form of water-indicator so efficient as that ^^5tc^. known as Haley's, illustrated in fig. 15. The copper float a is screwed upon a hollow spin- dle b, and to which steam is supplied through a hole at its [upper end, and from it to the interior of the'float a, so that the pressure is equal] within and [without. As soon as the VOL. I. water level falls, the float falls with it, and the conical end c drops out of its seat, and allows the steam to pass up the pipe </, and acts upon a whistle placed in e. However efficient a form of feed-apparatus may be, it is obvious that if not attended to it might as well not be there; rather, indeed, it would be better absent, for then no trust could be placed in it. Now, suppose that the attendant screws down the handle of the feed valve, closing it and admitting no water to the pump, the pump might continue to work well, yet no water be supplied to the boiler. The reader may here say that surely no man could be so stupid or blameworthy as to do this: as stupid and as blameworthy things as this are done every day, and being done now may be done again. Let the attendant, therefore, be sure that the hand- feed valve is open. Further, let him be sure that the rod a a, fig. 14, is not sticking in its stuffing-box e, for if so the feed will not act. Yet more, he must be positively certain that the force-pump is passing
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