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A watch glass is a circular concave piece of glass used in chemistry as a surface to evaporate a liquid, to hold solids while being weighed, for heating a small amount of substance, and as a cover for a beaker. When used to cover beakers, the purpose is generally to prevent dust or other particles from entering the beaker; the watch glass does ...
The face may also include a second hand, which makes one revolution per minute. The term is less commonly used for the time display on digital clocks and watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time. This is similar to the 12-hour dial above, except it has ...
A helen is a humorous unit of measurement based on the concept that Helen of Troy had a "face that launched a thousand ships". The helen is thus used to measure quantities of beauty in terms of the theoretical action that could be accomplished by the wielder of such beauty.
The Garmin Forerunner series is a selection of sports watches produced by Garmin. Most models use the Global Positioning System (GPS) , and are targeted at road runners and triathletes . Forerunner series watches are designed to measure distance, speed, heart rate (optional), time, altitude, steps, and pace.
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Figure 1: Martin mainspring gauge (front and back views). Actual size 181 x 30 mm. They were made by several European companies and are all similar to the gauge in Figure 1, being brass plates with notches on both edges and round sinks on both sides.
The watch was an 18-size, full plate design. In 1869, the National Watch Company won "Best Watches, Illinois Manufacture" at the 17th Annual Illinois State Fair, for which it won a silver medal. [3] The company officially changed its name to the Elgin National Watch Company in 1874, as the Elgin name had come into common usage for their watches.
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