MS-507 PVG POTENTIOMETER, ONE METER, 4 WIRE

On polished wooden base fitted with four plastic feet, with four
wires of 24 s.w.g constantan connected in series to give effective
length of 4 meter and a meter rule graduated 0-100 cm. and 100-0
cm x 1 mm.; provided with two terminals, plated brass strips and
knife edge jockey