TWO OPTIONS OF HEATERS FOR AQUARIUMS OFFER OUR READERS. Uniform temperature in the aquarium keeps the water-filled Cycling or any other appropriate size camera. It is placed as shown in the figure.
S. KINDLER, Saratov
Heaters that are commercially available — with a filament and salt, or bulky, or too powerful.
“Semiconductor” heater:
1 — wire bracket, 2 — tube, 3 — sand, 4 — tube, 5 — resistor, 6 — power cord with plug.
Within a few minutes you can make a “heating” coal resistors type MLT, VS-2, MT-2, etc. with a capacity of 2 watts. They are inserted into the glass tube, the ends are attached to power cord with plug and close the vial stopper. The power of the heater can be more than 20 watts.
V. BEDNYAGIN, Novocherkassk
Recommend to read
Roller Scooter
It seems incredible that the chrome-plated roller bike, one of the numerous exhibits at the Central Exhibition NTTM-82, was made by teenagers — it has a very "factory-made" appearance. And...
MAN-MADE BIRD “ALBATROS”
The peak of development of hydroaviation was in the middle of the 1930-ies. The main advantage of amphibians compared to ground vehicles, flying over extensive areas, it was considered a...
