MURRAY

In 1901, Baudot's code was modified by Donald Murray (1865–1945), which was prompted by his development of a typewriter-like keyboard. The Murray system used an intermediate step; a keyboard perforator, which allowed an operator to punch a paper tape, and then to use a tape transmitter for sending the message from the punched tape. At the receiving end of the line, a printing mechanism would print on a paper tape, and/or a reperforator could be used to make a perforated copy of the message. As there was no longer a connection between the operator's hand movement and the bits transmitted, there was no concern about arranging the code to minimize operator fatigue, and instead Murray designed the code to minimize wear on the machinery, assigning the code combinations with the fewest punched holes to the most frequently used characters.

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