Description:
Rectangular wooden resistance plug box consisting of four rows of five brass blocks, bridged on alternating sides by a metal piece to the row below. Between each pair of blocks is a removable plug, and in the middle of each block is a hole for mounting the moveable binding posts. (Currently placed at the ends and in the middle of the bottom row.) Each row of blocks is mounted on an individual hard rubber panel, supported by a wooden box. The resistance values are marked on the hard rubber panels: 1, 2 ,3, 4, 10, 20, 30, 40, 100, 200, 300, 400, 1000, 2000, 3000, and 4000 ohms.