102 



u. 



S. BUREAU OF FISHEEIES. 



4 .Kv;.i<PQ fhP necessity of using the steam boiler for this 

 ?:,:;.;«; dtn 4 tie t IneTmonths, thereby effectmg a considerable 

 raving in the amount of coal used. The device has been used to 



aerate 140 cans of fish for 14 hours without P^^^^PJ^S fo^ .^P^P^^'e?' 

 deterioration in the batteries, which have a capacity of 375 ampere 



hours. 



