110 NEW YORK ZOOLOGICAL SOCIETY 



Most of the enlarged tanks have already been lined in part 

 with rockwork, and this treatment will be resumed when a new 

 supply of material can be obtained. 



Another improvement effected by the employees under the 

 direction of the foreman, was the lowering of six wooden re- 

 serve tanks to a level where they are more accessible to the 

 attendants who care for them. Their original high position, with 

 their bottoms two feet above the tloor of the service gallery, made 

 them difficult to reach. 



A matter of importance connected with the work of enlarg- 

 ing tanks was the locating of several small leaks in the masonry 

 which appear to account for the loss of a considerable amount 

 of water from the reservoir. It is believed that the last of these 

 leaks has been discovered. 



Refrigerating Plant. — Aside from the enlargement of cer- 

 tain exhibition tanks, the most important improvement of the 

 year was the removal of the refrigerating engine and condenser 

 from the interior of the building to the top of the wall back of 

 the pump room. Advantage was taken of the change to abandon 

 the bulky tank and coil system, and install a condenser of the 

 modern double-tube type, which requires less space and gives 

 better service. The removal of this machinery became necessary 

 in order to comply with requirements of the Fire Department 

 for the special housing-in of ammonia-using equipment. 



Photographs of the room constructed for the refrigerating 

 plant and an interior view are presented herewith. The work 

 of dismantling the plant was done by the Aquarium force. It 

 was housed and installed under the direction of the Park De- 

 partment, for which work an appropriation of $1,500 was se- 

 cured from the City. It was in use during the past summer in its 

 new position, and gave satisfactory service. This water cooling 

 equipment is operated for about six months only — May to No- 

 vember — and its use is to reduce the summer temperature of 

 fresh water flowing to tanks containing salmon, trout and 

 other northern fishes, including eggs and young fry in the fish 

 hatchery. 



The space made vacant by the removal of the refrigerating 

 plant has already been utilized by the enlargement of two ex- 

 hibition tanks. 



