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I saw a Prince like this in the Smithsonian Museum.
Underlying the design of a simple clock like this is also a huge amount of mathematics.
Imagine figuring out for the first time how to translate the movement of the pendulum and gears into the precise keeping of the minutes and hours.
Today, the vast majority of watches and clocks are battery powered and timed by the vibrations of quartz crystals.
Quartz watches were not developed until the late 1960s. atomic clock is timed by the decay of Cesium atoms and is accurate to .0000001 seconds. time site for links to other fasinating sites about time history and technology.
For now it contains tennis racquets, racquetball racquets, clocks, GPS receivers, audio and video equipment, phones, boats, vacuum cleaners, books and rocks.
I've kept or picked up at garage sales several tennis racquets. Martin, Jr., was an avid tennis player since his days on the Norte Dame tennis team in the 1940s, a team which included Chris Evert's father. He got me interested in tennis when I was in my teens and for years we would play on Sundays with my sister and brother in law at the Mission Valley Tennis Club which was just recently torn down.
Even clocks and to watches can keep very accurate time today. This radio controlled alarm clock costs about the same as other alarm clocks at Target and consumes only one watt of power. similar in operation to the radio controlled alarm clock, this clock has a large LCD display which consumes a tiny fraction of the energy consumed by a LED display.
The Smithsonian Institution has a fascinating site, The Quartz Watch. The clock runs well over a year on two AA batteries.
I would always hit my leg with my follow through serving leaving two little cuts from the steel wire wrapped around the outside of the racquet. The Head is also in good condition, but needs to be restrung.
The green racquet, second to the right, is the first popular racquet model with an oversized head, the Prince Classic introduced in 1976, by Howard Head then working for Prince.
Go to page 1 of the article for a discussion of wood racquets and page 3 for graphite racquets.