[GreenKeys] : Re: Early Teletype in the principle

[Duncan Brown]

On 06-Jan-17 11:13, Juha Lahtinen wrote:
> Was the idea same as nipkow television.?
> Both type wheels go around in same phase .
Juha,

The very early (1850-1880) and very simple machines operated this way, 
but were slow and had problems with staying in synchronization.
In 1880, Emil Baudot came up with the idea of using a 5-bit code to 
represent the alphabet and thus produced the first truly digital 
communications system. But Baudot's system was synchronous also and 
continued to have problems staying in sync.

As Jim said, it was Howard Krum of the Morkrum Company that came up with 
the stop-start system that essentially synchronizes the machines on the 
start of each character. Almost all teletypewriters designed since the 
mid 1920s have used this principle.

Have fun,

Duncan
K2OEQ







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