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Light can be used to transmit data and analog signals. For example, lighting white LEDs can be used in systems assisting people to navigate in closed spaces while searching necessary rooms or objects. [100] Assistive listening devices in many theaters and similar spaces use arrays of infrared LEDs to send sound to listeners' receivers.
The next major drop in price came about in the 1880s with the introduction of electric lighting in the form of arc lights for large space and street lighting, followed by incandescent light bulb-based utilities for indoor and outdoor lighting. [3] [5] Over time, electric lighting became ubiquitous in developed countries. [6]
Indoor-outdoor thermometer. An indoor–outdoor thermometer is a thermometer that simultaneously provides a measurement of the indoor and outdoor temperatures. The outdoor part of the thermometer requires some kind of remote temperature sensing device. Conventionally, this was done by extending the bulb of the thermometer to the remote site.
A firepole in Cologne with a door at the entry. Losing one's grip on the pole can result in falling from a great height; the firefighter may hit an object such as a door extending from a truck; poor speed control can result in injured or even broken legs upon impact with the floor; and burns can occur due to friction if the skin rubs against ...
Panasonic Holdings Corporation [b] is a Japanese multinational electronics company, headquartered in Kadoma, Osaka Prefecture, Japan.It was founded in 1918 as Matsushita Electric Housewares Manufacturing Works [c] in Fukushima, Osaka City by Kōnosuke Matsushita.
The four-foot-tall machines were purchased from the new Kinetoscope Company, which had contracted with Edison for their production; the firm, headed by Norman C. Raff and Frank R. Gammon, included among its investors Andrew M. Holland, one of the entrepreneurial siblings, and Edison's former business chief, Alfred O. Tate. [50] The ten films ...