Tektronix 1S1 Instruction Manual page 150

Voltage readings are given in volts dc. Voltage measurements taken in
any particular Type 1S1 may vary somewhat from those given, due
to, normal differences in component characteristics.
Waveform photographs were taken with a Tektronix Oscilloscope
Camera System and Projected Graticule.
SCHEMATIC SYMBOLS
Front-panel title
Clockwise control rotation
Screwdriver adjustment
Electrical limit of etched-
wiring board
Soller connection to etched-
wiring board
(around name)
(blue line)
(black dot)