10
VICTOR L. LOOSANOFF AND HARRY C. DAVIS
near the optimum for growth of algae, such as Isochrysis galbanu
(Ukeles, 1961), which are the best larval foods, this temperature level
ia often maintained. However, because 24°C is somewhat above normal
room temperature, our simplest and most commonly used temperature
control devices are lead-lined water tables, 3 f t x 12 ft, that serve &B
constant temperature water baths (Fig. 6). These tables are filled to a
depth of 3 to 4 in with tap water, which is kept in constant circulation
by a pump that takes water at one end of the table and discharges it
Expansion tonk
Thermostat
Clrculotion pump
FIG. 6. Two methods of heating water for constant tempereture baths. Diagram of
closed system above, and open system below.
at the other end. A Minneapolii+Honeywell thermofitat (T41 SA323XA3)
with the sensing bulb enclo~ed in a lead pipe, immered in the water
on the table, controls a 1000- or 1500-W immerfiion heater. Tho
heater may be either inserted in the pipeline, through which the circulating pump transfers-water from one end of the table to the other
(open system) or it may be inserted in a small hot wabr tank anti tho
heat transferred to the water on the table by passage of the watcr
from the tank through a lead coil or loop immersed in the water on
the table (clot~ed or hcat exchangc: sy,rtcm) (Fig. 6).
VICTOR L. LOOSANOFF AND HARRY C. DAVIS
near the optimum for growth of algae, such as Isochrysis galbanu
(Ukeles, 1961), which are the best larval foods, this temperature level
ia often maintained. However, because 24°C is somewhat above normal
room temperature, our simplest and most commonly used temperature
control devices are lead-lined water tables, 3 f t x 12 ft, that serve &B
constant temperature water baths (Fig. 6). These tables are filled to a
depth of 3 to 4 in with tap water, which is kept in constant circulation
by a pump that takes water at one end of the table and discharges it
Expansion tonk
Thermostat
Clrculotion pump
FIG. 6. Two methods of heating water for constant tempereture baths. Diagram of
closed system above, and open system below.
at the other end. A Minneapolii+Honeywell thermofitat (T41 SA323XA3)
with the sensing bulb enclo~ed in a lead pipe, immered in the water
on the table, controls a 1000- or 1500-W immerfiion heater. Tho
heater may be either inserted in the pipeline, through which the circulating pump transfers-water from one end of the table to the other
(open system) or it may be inserted in a small hot wabr tank anti tho
heat transferred to the water on the table by passage of the watcr
from the tank through a lead coil or loop immersed in the water on
the table (clot~ed or hcat exchangc: sy,rtcm) (Fig. 6).