Willoughby Smith discovered the photoconductivity of the element selenium in 1873, laying the groundwork for the selenium cell phototube which was used as a pickup in most mechanical scan systems.
22.
He showed how, when he turned on a lamp to illuminate a selenium cell, a bell would ring, when the lamp was off, the bell would stop.
23.
These included 14 for the telephone and telegraph, four for the photophone, one for the phonograph, five for aerial vehicles, four for " hydroairplanes " and two for selenium cells.
24.
On 7 December 1915 English inventor Harry Grindell Matthews demonstrated, in a secret test on Pen Ponds, how selenium cells would work in a remotely controlled prototype weapon for use against German Zeppelins.
25.
The 20-year overdue replacement of the external selenium cell of the Zenit E by TTL-metering is said to be the work of an employee who made a conversion on his own accord.
26.
The Nikkorex Zoom 35 was a variation on the Nikkorex 35 II . Released in 1963, the Zoom 35 shares the Nikkorex 35 II's distinctive nameplate mounted to a black selenium cell meter.
27.
In 1931, the German engineer Bruno Lange developed a photo cell using silver selenide in place of copper oxide, although the prototype selenium cells converted less than 1 % of incident light into electricity.
28.
Try searching on " selenium cell ", this was the first type of LDR and I think it was invented around the end of the 19th century .-- Bob Mellish 16 : 35, 21 November 2005 ( UTC)
29.
Beginning in 1907, Stebbins began the first measurements using the selenium cell photometer first on the moon and then later, as the sensitivity of the instrument was improved, on variable stars He examined eclipsing binaries such as Algol starting in 1910.
30.
The selenium cell took the place of a carbon microphone also a variable-resistance device in the circuit of what was otherwise essentially an ordinary telephone, consisting of a battery, an electromagnetic earphone, and the variable resistance, all connected in series.
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