THIRTY USEFUL DEVICES 



107 



or four times. There will be a great fluttering inside 

 and the dust will fill the chicks' feathers very com- 

 pletely. Then replace these chicks with three others, 

 and more of the insect powder. 



Heating a House For a brooder house, hot 

 water systems have the advantages of economy of fuel, 



FIG IO4 : HEATER FOR POULTRY HOUSE 



with safety and ease of control. The piping is larger 

 and costs somewhat more than for steam. The style 

 shown in Figure 104 is quoted by an agricultural 

 supply company at eighteen dollars to eighty-four 

 dollars, according to size, and including all piping, 



