SHIP’S RADIO ROOM CLOCK, CHELSEA CLOCK COMPANY.  FAST SLOW ADJUSTMENT IS LOCATED ON THE MIDDLE RIGHT CLOCK FACE.  MARKED CHELSEA JUST BELOW CLOCK CENTER.

RADIO ROOM CLOCKS
The sinking of the Titanic resulted in the Radio Act of 1912 that required 24-hour radio watches. The disaster also led to clocks in the newer radio rooms featuring three-minute periods marked in red. That three minutes provided a silent period when only emergency radio messages could be transmitted.​​