Show MAMMOTH INCUBATOR A hatching machine that does the work of one oae thousand setting hens tho the largest incubator in the world with a capacity of eggs has just been completed by W P F hall biall of pembroke N Y it Is feet long and 4 feet 4 inches wido wide partitions divide it into compartments each accommodating two trays the trays have wire bottoms and hold 76 75 eggs each to nil fill this incubator a single time with common not thoroughbred eggs woud require an expenditure of for eggs of the requisite freshness would cost forty cents a dozen As one hen ben covers fifteen eggs for hatching the incubator does the work of 1000 fowls or has the capacity of 0 one hen sitting constantly tor for nearly ton ten years the incubator la Is heated by means of a coll coil of eight steam pipes passing over tho the top of tho the egg chamber charat cr ou one side and returning on the other these pipes are connected at one end of the structure to a water tank and heater the water flowing through the pipes Is heated to exactly the right temperature a thermostat attached to tho the stove opening and closing the drafts to mako make this possible the only attention required by tho the heater Is 13 supplying it with coal night and morning the thermostat Is an expansion tank 10 by 18 inches which stands over th the 0 h heater e ater tho the tank Is diled with oil all in which is a float As tho the heat of the furnace warms tho the water the water in the jacket surrounding the heater expands and the float in tho the oil rises this movement closes a throttle attached to tile the floa tarm and shuts tho the draft of the heater another lover lever at tho the same time opens tho the cold air draft of tho the furnace in this way the temperature pera ture is regulated automatically with extremely little variation the tha eggs being kept at degrees F A second novel feature Is that tho the heat of the eggs is regulated by rats rals ing or lowering them in the egg chamber which Is nearly a foot high inside burlap bullai separating it from we the pipes the egg trays rest on double frames hinged by galvanized arms or lovers levers As tho the chicks develop the trays traya are lowered on these supports tho the first drop being made in six days and others at intervals until on the twenty first day the trays are resting on the bottoms of the chambers all infertile eggs aro are tested out on the seventh day mr hall built small incubators at first but tho the oil bill for forty ot of his small incubators with eggs egg capacity was for a season while a largo large incubator was run three ahrea months at an expense of less than 3 8 tor for coal |