Inscription
"MARCONI'S WIRELESS / TELEGRAPH CO. LTD. / NO. 93283 LONDON" printed on brass maker's plaque upon upper surface. "A", "B", "C" printed on three separate celluloid plaques upon upper surface. "NOTE / THE SWITCHBOARD IS CON- / NECTED UP FOR 120 VOLT / SUPPLY. / FOR / 100V SHORT CIRCUIT / TERMINALS AB / 80V SHORT CIRCUIT / TERMINALS AC / AT BACK OF BOARD" printed on celluloid plaque upon centre of upper surface. "ACCRS / MAIN" printed on upper surface of left-hand switch. "CHARGE / DISCHARGE" printed on upper surface of right-hand switch. "VOLTS / EVERETT, EDGCUMBE & CO. LTD." printed upon interior dial of voltmeter.