Capacitance Substitution Box

Comprising 12 non-polarised capacitors ranging from 100pF to 0.47mF using standard  preferred values, in step ratios of approximately 1:2 Selection is by means of a rotary  switch and external connection is via a pair of 4mm sockets. All capacitors are of ± 2% tolerance, 250V D.C.
Working with values as follows:
0.1mF, 0.22mF, 0.33mF, 0.47mF, 1mF, 2.2mF, 3.3mF, 4.7mF, 10mF, 22mF