12 Director's Report of the 



out running the machinery. The power for the compressor and 

 other machinery is furnished by a Straight Line, high speed, cen- 

 ter crank horizontal engine which,, at a steam pressure of 70 

 pounds and speed of 260 revolution;?, gives about 25-horse power. 



In refrigeration the gaseous ammonia is drawn from the expan- 

 sion coils and passes through the water-jacketed compression cylin- 

 der where it is liquefied by a pressure of from 150 to 200 pounds. 

 On its way to the cooling coils and tank the liquefied ammonia 

 passes through a long, slender cylinder where by the action of 

 gravity, it is freed from the oil used in lubricating the compressor. 

 In the coils of the condenser the heat is drawn from the ammonia 

 until the latter reaches the temperature of the city water sur- 

 rounding the coils. From the cooling tank the liquid passes to 

 the expansion coils as required, and by its rapid evaporation, con- 

 trolled by expansion valves, withdraws the heat from the air or 

 the brine surrounding the coils. The temperature can be reduced 

 to a point far below freezing. 



Departments and their equipment. — Handsome oak and glass 

 doors lead into the entry from the front and from the entry into 

 a central hall and staircase. Occupying the left side of the main 

 building and the east wing are the five rooms devoted to horticul- 

 ture. These consist, in succession from the entrance and all com- 

 municating, of the horticulturist's office, 18 by 15 feet, with a 

 large dark closet attached; horticulturist's laboratory, 20 by 14 

 feet; assistant horticulturists' office, 20 by 17^ feet; assistant hor- 

 ticulturists' laboratory, 32 by 14 1-3 feet; and museum, 32 by 

 14 2-3 feet. The offices here, as throughout the building, are 

 provided with large roll-top desks, revolving bookcases, specially 

 planned and commodious wall cases and comfortable desk and 

 office chairs, all the furniture being of oak. The laboratories 

 each have a large work-table, with Alberene stone top and sink, 

 fitted with the conveniences previously mentioned. The win- 

 dows are provided with wide microscope tables or shelves, and 

 these as well as the projecting ledges of the microscope and 



