1848 



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are hinged at the bottom, they may be allowed to drop part of the way 

 open and they may be fastened securely in this position by a small chain 

 or a strong cord. By this method of ventilation the air passes over the 

 windows and into the room, an arrangement that does not permit direct 

 drafts to reach the incubators. It is also advisable to place muslin curtains 

 over the windows that are left open permanently, depending on the other 

 windows for most of the light. The latter may be shaded in case the 

 sun shines through them on the incubators or in case the sunlight affects 

 the temperature of the room. 



The writer's idea of a very good incubating cellar is represented in 

 Fig. 61.4 



Fig. 61. — A good incubating cellar 



THE OIL SUPPLY 



A considerable amount of labor may be saved by piping the oil to 

 the incubating room. This is often done by placing an oil tank under- 

 ground a few feet from the cellar wall, the oil being conveyed from the 

 tank to the cellar by means of a small pipe. This pipe is connected 

 with one or more faucets. A very simple and inexpensive arrangement 

 is shown in Figs. 62 and 63. The framework on which the barrel of oil 

 rests is made of planks about twelve inches wide. The upper edges 

 of these planks are cut so that they conform to the shape of the barrel. 

 The barrel should be placed in the shade in order to prevent evaporation 

 of the oil, and if possible it should be placed on the north side of the build- 

 ing. If this position is inconvenient, the barrel may be placed on the 

 east or the west side of the building, under an open shed. 



* The incubating cellar in the illustration belongs to Mr. Joseph Tolman of Rockland, Massachusetts. 



