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on the coating for long enough to destroy every trace of earlier recordings. The tape is left completely demagnetised and is therefore free from hiss.
The Controls
On a modern tape recorder the controls to achieve all this are few and simple. Although some relate to the amplifier and others to the mechanism, they are often grouped together and interlocked to reduce the risk of mistakes. For example, the record/playback switch on the amplifier is often combined with the control which stops and starts the tape drive.
Almost all popular recorders will run at a tape speed of 1\ inches per second, but many will operate also at alternative speeds.
Changes from one speed to another may be produced in a variety of ways. Sometimes a knob or button provides immediate control. On other machines, it is necessary to interchange capstans or transfer a belt from one pulley to another. At the opposite extreme are those recorders in which the speed is infinitely adjustable over a certain range.
Threading and Connecting
Threading a tape recorder is even simpler than threading a projector, because there are no sprockets or claws to worry about. On the other hand, since the reels are reversible, you must put the full reel of tape right way up on the feed reel spindle. As you unwind a little tape and pass it over the recording head to the capstan, the coated side of the tape must face the recording head. Any felt pressure pads should bear on the shiny or uncoated side of the tape. On some machines, a line on the base plate indicates the path of the tape and makes threading particularly easy. Many recorders also use drop-in threading; you have only to lay the tape in a slot before attaching the free end to the take-up reel just as you would with a film on a projector. Then, when you set
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