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  2. Chelsea Clock Company - Wikipedia

    en.wikipedia.org/wiki/Chelsea_Clock_Company

    The Chelsea Clock Company is an American clock manufacturing company founded in 1897. Clocks produced by Chelsea Clock Company have been found in the White House, on US Naval Ships, and in homes and offices around the world. The company continues to build and repair clocks at their corporate headquarters in Chelsea, Massachusetts.

  3. Marine chronometer - Wikipedia

    en.wikipedia.org/wiki/Marine_chronometer

    A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

  4. Naval Hospital Boston - Wikipedia

    en.wikipedia.org/wiki/Naval_Hospital_Boston

    When it was decommissioned in 1974, it was the oldest naval hospital in service in the United States and consisted of 88 acres (360,000 m 2) of land on the Mystic River. Notable patients during the hospital's history include Presidents John Quincy Adams (after his presidency) and John F. Kennedy (before his presidency). [ 1 ]

  5. Naval Hospital Boston Historic District - Wikipedia

    en.wikipedia.org/wiki/Naval_Hospital_Boston...

    Naval Hospital Boston Historic District is a historic district at the south end of Broadway in Chelsea, Massachusetts. The district encompasses the area around the former Chelsea Naval Hospital. It consists of five buildings, historically the original 1836 Naval hospital, the 1857 Marine hospital, the Commanding Officer's quarters, and two ...

  6. 1 Main Circuit - Wikipedia

    en.wikipedia.org/wiki/1_Main_Circuit

    1 Main Circuit (1MC) is the term for the shipboard public address circuits on United States Navy and United States Coast Guard vessels.This provides a means of transmitting general information and orders to all internal ship spaces and topside areas, and is loud enough that all embarked personnel are (normally) able to hear it.

  7. Time ball - Wikipedia

    en.wikipedia.org/wiki/Time_ball

    Royal Observatory, Greenwich, London.Installed in 1833, a time ball sits atop the Octagon Room. A time ball or timeball is a time-signalling device. It consists of a large, painted wooden or metal ball that is dropped at a predetermined time, principally to enable navigators aboard ships offshore to verify the setting of their marine chronometers.