no longer manufactured. The prominent and best 

 feature was its valve engine with a chain weight 

 (similar to a clock weight) for its motive power. 

 The paddles of the valve engine worked in water 

 and glycerine, with a few drops of carbolic acid to 

 keep it from spoiling. N, N, were water foun- 

 tains supplying water to the moisture pans. From 

 i to 2 quarts was evaporated in 24 hours. 



FIG. 2. 



Fig. 2 shows the thermostat and its connections 

 with the valve engine. The weak points of this 

 machine were its thin walls and imperfect ther- 

 mostat, but it was superior to nine-tenths of the 

 incubators on the market to-day. In fact, with 

 four exceptions, the incubators of ten years ago 

 were ahead of the ones now offered for sale. In 

 1885 a 216 egg capacity Thermostalic incubator 

 sold for $100. We think it could not have cost 

 82 



