_Don"t_ use condensers with paper dielectrics for an amplifier receiving set or it will be noisy.
_Don"t_ expect as good results with a loop aerial, or when using the bed springs, as an out-door aerial will give you.
_Don"t_ use an amplifier having a plate potential of less than 100 volts for the last step where a loud speaker is to be used.
_Don"t_ try to a.s.semble a set if you don"t know the difference between a binding post and a blue print. Buy a set ready to use.
_Don"t_ expect to get Arlington time signals and the big cableless stations if your receiver is made for short wave lengths.
_Don"t_ take your headphones apart. You are just as apt to spoil them as you would a watch.
_Don"t_ expect to get results with a Bell telephone receiver.
_Don"t_ forget that there are other operators using the ether besides yourself.
_Don"t_ let your B battery get damp and don"t let it freeze.
_Don"t_ try to recharge your B battery unless it is constructed for the purpose.
STORAGE BATTERY DON"TS
_Don"t_ connect a source of alternating current direct to your storage battery. You have to use a rectifier.
_Don"t_ connect the positive lead of the charging circuit with the negative terminal of your storage battery.
_Don"t_ let the electrolyte get lower than the tops of the plates of your storage battery.
_Don"t_ fail to look after the condition of your storage battery once in a while.
_Don"t_ buy a storage battery that gives less than 6 volts for heating the filament.
_Don"t_ fail to keep the specific gravity of the electrolyte of your storage battery between 1.225 and 1.300 Baume. This you can do with a hydrometer.
_Don"t_ fail to recharge your storage battery when the hydrometer shows that the specific gravity of the electrolyte is close to 1.225.
_Don"t_ keep charging the battery after the hydrometer shows that the specific gravity is 1.285.
_Don"t_ let the storage battery freeze.
_Don"t_ let it stand for longer than a month without using unless you charge it.
_Don"t_ monkey with the storage battery except to add a little sulphuric acid to the electrolyte from time to time. If anything goes wrong with it better take it to a service station and let the expert do it.
EXTRA DON"TS
_Don"t_ think you have an up-to-date transmitting station unless you are using C.W.
_Don"t_ use a wire from your lightning switch down to the outside ground that is smaller than No. _4_.
_Don"t_ try to operate your spark coil with 110-volt direct lighting current without connecting in a rheostat.
_Don"t_ try to operate your spark coil with 110-volt alternating lighting current without connecting in an electrolytic interrupter.
_Don"t_ try to operate an alternating current power transformer with 110-volt direct current without connecting in an electrolytic interruptor.
_Don"t_--no never--connect one side of the spark gap to the aerial wire and the other side of the spark gap to the ground. The Government won"t have it--that"s all.
_Don"t_ try to tune your transmitter to send out waves of given length by guesswork. Use a wavemeter.
_Don"t_ use _hard fiber_ for panels. It is a very poor insulator where high frequency currents are used.
_Don"t_ think you are the only one who doesn"t know all about wireless. Wireless is a very complex art and there are many things that those experienced have still to learn.
THE END.