BELDT’S AQUARIUM 
SAINT LOUIS, MO 
THERMOSTATIC CONTROLS 
AND 
AIR RELEASERS 
Condenser Plug 
Each 35c, postpaid 
For the elimination of Radio 
interference, to be used with any 
type of thermostat you now have. 
Schickerling Ultra Violet 
Lamps 
These new patented Ultra Vio¬ 
let Lamps will operate on 110 
volts A. C. or D. C. currents. 
Tropical fish and plants can be 
kept without sunlight in good 
growing condition and healthy. 
If you are unable to keep your 
fish in a southern or eastern ex¬ 
posure this is just what you 
need. For the winter months 
they are indispensable. 
Watchman Thermostats 
These automatic heat regula¬ 
tors will maintain a range of 
proper temperatures for tropical 
aquariums and are set for about 
75° P. All are fitted with pure 
silver contact points. All of 
these thermostats are fitted with 
hangers and water-proof exten¬ 
sion cords. 
No. 1 
500-watt capacity, complete 
with outside control knob, will 
not interfere with radios. Has 
three-way plug attachment so 
that three heaters may be hooked 
to this one regulator. Size of 
glass tube, 8x1 inches. 
Price .$3.75 
No. 2 
400-watt capacity with inside 
regulator, also has three-way 
plug attachment so that three 
heaters may be used with this 
regulator. The glass tube has an 
overall length of 8 inches. 
Price .$2.25 
No. 3 
100-watt thermostat is de¬ 
signed for two heater units for 
aquariums up to 30-gallon ca¬ 
pacity; the heat regulator is on 
the inside; the glass tube is 6 
inches long. Price..$1.(>5 
Watchman Thermostats 
Note 
When adjusting these thermo¬ 
stats, a fraction turn to the right 
increases the temperature and to 
the left lowers the temperature. 
Tubular Type 
25-watt, 5% in. long. 
40-watt, 5% in. long. 
60-watt, 11% in. long. 
Sea Foam Air Releasers 
Each Dozen 
IVo. 1—1% in. round airstone. $1.50 $15.00 
No. 2—1 in. round airstone. 1.35 13.50 
No. 3—1 in. square airstone. 1.35 13.50 
No. 4—1% in. diam. by 1% in. cone shape. 1.50 15.00 
Nos. 1, 2, 3 and 4 airstones are mounted on chromium 
plated fittings. The chromium plated brass tubing has a 
040x3/16 in. wall and an overall length of 16 inches. 
No. 5—Ornamental diver with air release in helmet, an at¬ 
tractive novelty. Each.$1.00 
No. 0—Airstone with fitting for rubber tubing. 
Each.$0.25 Dozen.$2.50 
No. 7 —Needle valve for adjusting airflow in each outlet, 
also has tee for continued line. 
Each.$0.50 Dozen.$5.00 
No. 8—Tee pieces for branch connections. 
Each.$0.20 Dozen.$2.00 
No. 9— Adjustable metal air release for rubber tube con¬ 
nection. Each.$0.40 Dozen.$4.00 
No. 10—Rubber tubing for airlines from the airpump to out¬ 
lets. No. 2 grade black. 
3 ft.$0.10 50 ft.$1.50 100 ft.$2.S0 
No. 10-A—Best grade rubber tubing. 
3 ft.$0.15 50 ft.$2.00 100 ft.$3..50 
\o. 11—U channel black rubber for fastening to the ends of 
glass partitions, will fit glass from single window 
thickness up to 3/16 in. plate glass. With the aid 
of these U channel partitions may be made tight 
without danger of breakage. 
$ 1.00 
1.50 
2.50 
A special condenser is buiit in 
these thermostats to prevent ra¬ 
dio interference. 
Ali thermo.stats have 3-way 
plugs as illustrated. 
These thermostats only regu¬ 
late the temperature and can be 
used with any non thermostatic 
controlled heater. 
Price—Per foot. $0.10 5 feet. $0.40 
SEAFOAM AIR RELEASERS 
Page 34 
