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
BLACK SEA SHALANDA
"...The barge is loaded mast and folded sail, half pushed into the sea, floated on a light wave... The boys came over and, without much difficulty pushing the barge, jumped into...
THE MEASURING PROBE
Love to collect basic and necessary household appliances. One of them is the homemade probe, which is designed not only for "continuity" of the electrical circuits in the range of 5-300...
