|Found Time Tank by Randall Cleaver, currently on display at NWCM|
The museum is heaven for horologists, history lovers and steampunk afficionados (they had a Victorian ball last year).
National Company, Inc of Malden, Massachusetts. It was also the first self-contained portable atomic clock. (It was about the size of a filing cabinet, so not portable as in "carry it in your briefcase".) Atomic clocks use the oscillations of atoms in a gas to mark frequency (in this case, cesium). It is so accurate it would only lose a second in 32,000 years.
Hamilton Watch Company (in nearby Lancaster PA) which developed the watch in early 1970. It had an 18 carat gold case, and was the world's first all-electronic digital watch, using a digital display with LEDs A button was pressed to display the time. The first Pulsar initially sold for $2100. (The equivalent of $11,000 today.) Eventually they manufactured watches which also monitored heartbeat and had a tiny little calculator.
And then there's the sheer beauty of gears, cogs, wheels and such.
The museum has hundreds of case clocks, pocket watches, table clocks, cuckoo clocks...if it told time, they've probably got an example of it. There's even a replica (non-working) of the Antikythera mechanism. So, if you're ever in the south central Pennsylvania area, pay a visit. (Certain exhibits change, so check the site before you go.) National Watch and Clock Museum