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The audience measurement of U.S. television has relied on sampling to obtain estimated audience sizes in which advertisers determine the value of such acquisitions. . According to The Television Will Be Revolutionized, Amanda D. Lotz writes that during the 1960s and 1970s, Nielsen introduced the Storage Instantaneous Audimeter, a device that sent daily viewing information to the company's ...
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.
A case for a pocket watch, 1870. The outer clamshell protects the watch. The inner layer contains a glass window. The ring is for the attachment of a chain. A usually metal clamshell case for a mechanical watch, [1] common until the early twentieth century. It is meant to sit around the inner case of the watch. [2]
Regular wearing of a quartz watch significantly reduces the magnitude of environmental temperature swings, since a correctly designed watch case forms an expedient crystal oven that uses the stable temperature of the human body to keep the crystal oscillator in its most accurate temperature range.
The hand-winding movement of a Russian watch. A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves.
The ligne is still used by French and Swiss watchmakers. There are 12 lignes to one French inch ().The standardized conversion for a ligne is 2.2558291 mm (1 mm = 0.443296 ligne), [4] and it is abbreviated with the letter L or represented by the triple prime, ‴. [5]
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