A Simple Data Transmission System Using the Office Telephone
A method has evolved for transmitting data of
a type originating in many laboratory situation 
direct to a central computer.  The method requires almost
no specialized equipment and uses any ordinary 
telephone on a "callup" basis.  Present applications
include cardiac-output calculations, radio-activity 
tracer studies and neurophysiology time-sequence studies of nerve impulses.
CACM October, 1965
Neilsen, I. R.
