Method of Operating
35
spaced by holding the key lever up for a given period of time, and the words being spaced by still longer periods.
The proper arrangement of the dots, dashes, and spaces constitutes a code. The Morse code is extensively used in America, while a modification of it, called the Continental code, is employed in England and on the
Fig. 17.—Types of Keys.
continent of Europe. These are shown in Fig. 19. When the key lever is depressed, two insulated pieces of platinum, called contacts, touch one another, closing the low-pressure circuit of the induction coil or transformer.
