HELPS IN HATCHING SEASON 69 



isinglass window is to see the flame of the lamp and 

 should be cut where the flame can be readily seen. A 

 large fount lamp with a Number 2 burner is placed 

 on a slide that can be pushed under the incubator (as 

 shown in Figure 70), when removed for trimming. 



The legs hold up the drawer when drawn out, 

 and t the handle is merely a crosspiece fastened to 

 them. ' The legs extend three inches below the bottom 

 of the incubator, and they just clear the floor when 

 the incubator is placed on two pieces of scantling to 

 allow air to pass up through the pipes in the ven- 

 tilator box. 



After setting the incubator in the place where it 

 is to be used, put sand into the boxes around the lamp 

 pipes, and put sawdust in the ventilator box up to 

 within one inch of the top of the pipes; also in front 

 of the drawer and all around the sides, and on top of 

 the heater up to within an inch of the top of the escape 

 pipes, being careful not to allow any sawdust to get in 

 the pipes. Cover the sawdust with paper, allowing 

 the pipes to be open. 



You are now ready to light the lamps. Use head- 

 light oil (one hundred and fifty degrees test), keep the 

 lamps at a medium hight, and in a few days you will 

 have the incubator thoroughly heated. By observing 

 the two good thermometers in the front and back ends 

 of the drawer, you can easily keep the temperature at 

 one hundred and three degrees by turning the lamp 

 screws up or down. When you have the machine 

 under proper control, put the eggs in, and in about 

 twelve hours they will be warm enough without turn- 

 ing up the lamps, and they will remain so unless the 

 lamps are changed when filled and trimmed. 



By trimming every other day, and filling daily, 

 the temperature can easily be kept uniform by looking 

 at the thermometers every six hours and turning the 



