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D.C. A favourite type of transformer is one fitted with an automatic tapping-control, which allows the voltage to be adjusted whilst the projector is in use. It is also fitted with an illuminated voltmeter.
When adjusting the transformer always remember that to increase the voltage you use a lower tapping, and to decrease the voltage you use a higher tapping, (i.e.) To increase the voltage by 10 when the tapping is set at 230, adjust it to read 220.
Electrical Connections
All electrical circuits for lighting and power are somewhere fitted with a small section of wire which, because it is weaker than the rest of the circuit, will immediately fuse and break in the event of overloading. And that particular section, as you already know, is what we call the fuse. The fuse is a safety valve, and must be considered and treated as such. It can prevent damage to your equipment, provide a warning against overloading, and at times may possibly prevent your house from catching fire. When a fuse blows it must not be replaced by a hairpin, a nail, a paper-clip, nor anything else other than a new fuse of the correct rating.
The fuse governing household lightingcircuits is usually one of 5 amps. For domestic heating and power, 10, 15 or 25-amp fuses may be in use. And the rating of the (original) fuse is your best indication of the normal load for any particular circuit providing, of course, that it was fitted by a competent electrician.
It is quite possible that your equipment can be connected to the lighting-circuit without blowing the fuse, which means that the current then set in motion does not exceed 5 amps. But should you use extra equipment on the same circuit (another projector or an electric fire, for instance) and replace the normal fuse for one of 10 amps, you would then be guilty of overloading and would at the same time make your fire insurance-policy not worth the paper on which it is printed.
You are not to connect any projector to a domestic lightingcircuit. Instead you must use a proper power-point. This is a a general instruction and an important one, irrespective of the fact you may be able to prove otherwise.
Ever had an electric shock? One way of preventing shocks is by effectively earthing the projector, which means that it has
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