BIRD HOUSES AND HOW TO BUILD THEM 
13 
Fig. 35.—Longitudinal vertical section of 
martin house; lowered, and doors closed. 
Fig. 36.—Roof of martin house 
attached solidly to pole. 
Fig. 37.—Martin 
house lowered; 
doors closed. 
Fig. 38.—Martin 
house in place; 
doors open. 
Fig. 39.—Proper way to 
make first “hitch” of 
rope on hook of coun¬ 
terweight. 
