Analog (Graphical) Instruments
Brent A. Gregory · 1973
The majority of the instruments described in Chapter 1, while giving a continuous indication of the measurand, have required the presence of an operator to observe variations in reading magnitude. This limitation is overcome in some of the graphical recording instruments, in particular those designed to record permanently variations in the level of a quantity, and with the ever-increasing emphasis on automation, continuously recording instruments are finding many applications, temperature recorders being but one example.