PIKES AND PIKE PERCH p | 
The jars are then placed on a battery. Tin tubes are inserted 
in the jars and connected with faucets that supply the water by 
rubber tubes. For convenience and economy of space and water 
the hatching jars are arranged in tiers, constituting what is known 
as a battery. A Downing jar in operation and one showing the 
collecting tanks and battery at the Put in Bay (Ohio) hatchery 
are shown in Figures 2 and 3. 
The troughs of the battery usually are constructed of white pine 
or cypress 1% inches thick. If it is necessary to make the troughs 
longer than the usual cuts of lumber the joints should be squarely 
butted, and these and all other joints in the troughs should be put 
together with white lead. At the splice a patch is placed on the 
inside of each trough and screwed to the two ends, white lead being 
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Fic. 3.—General view of pike-perch hatchery, showing method of removing fry from tanks 
used freely underneath. The ends of the troughs are rabbeted in 
place, and the side pieces are nailed to the bottom. At one end of 
each trough, in the bottom, is a 114-inch hole supplied with a plug, 
for ‘use in cleaning the troughs. At the alternate ends of each 
trough, commencing at the top, is a saw cut 11% inches deep and 6 
inches wide, into which is fitted a galvanized iron or tin. overflow 
spout to conduct water to the trough next below. The length of 
the troughs varies according to the size of the battery. Their “inside 
dimensions are 1014 inches deep and 8 inches wide. 
At the proper distance apart, along the sides of the troughs, are 
holes for the wooden faucets; for ease in manipulating the jars 
these holes should be 714 inches on centers and 3 inches above the 
inside bettom of the trough. The best faucets are the Crandell with 
the tin key. The faucet is connected with the tin tube by a piece 
of rubber tube 8 or 10 inches long and one-half inch in diameter. 
The tin tube is seven-eighths inch in diameter and 20 inches long; 
