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  2. Signal lamp - Wikipedia

    en.wikipedia.org/wiki/Signal_lamp

    A signal lamp (sometimes called an Aldis lamp or a Morse lamp [1]) is a visual signaling device for optical communication by flashes of a lamp, typically using Morse code. The idea of flashing dots and dashes from a lantern was first put into practice by Captain Philip Howard Colomb , of the Royal Navy, in 1867.

  3. Parabolic aluminized reflector - Wikipedia

    en.wikipedia.org/wiki/Parabolic_aluminized_reflector

    A PAR56, for example, is 56 eighths of an inch (7 inches) in diameter; a PAR36 is 36 eighths (4.5 inches) in diameter, and so on. Similarly, the diameter in millimeters can be found by multiplying the PAR designation by 3.175. For example, a PAR16 lamp is approximately 2 inches or 50.8 mm in diameter. [1]

  4. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    9/12 (Gen 2 and 3) 1968–1980 Rotating 126 dB at 100 ft. Design changed at least three times throughout production. The most common port ratio is 9/12. The standard Allertor 125 can produce 2 tones. Alert and Attack (Wail). A third signal was also available, Yelp, which required a special type of motor and used a reversing magnetic starter.

  5. M734 fuze - Wikipedia

    en.wikipedia.org/wiki/M734_fuze

    M734 fuze cross section Amplifier (top) and oscillator. The M734 multi-option fuze [1] is a rangefinder and collision detection system used on 60 mm, 81 mm, and 120 mm mortar shells as a trigger to detonate the shells at the most damaging heights of burst when combating four types of battlefield threats:

  6. Mars Light - Wikipedia

    en.wikipedia.org/wiki/Mars_Light

    Tri Lite, Inc. announced its acquisition of the Mars Signal Light Company, on January 23, 1991. Tri Lite still manufactures many of the traditional Mars Lights under the Tri Lite Mars brand. The company has since updated the Mars "888" Traffic Breaker with energy-efficient LEDs replacing the earlier sealed beam halogen/incandescent lamp.

  7. Eurorack - Wikipedia

    en.wikipedia.org/wiki/Eurorack

    3U (5.06 inches or 128.5 mm), where height "U" is measured in rack units, rounded for a lip (nb: 3U in standard rack units would be 5.25 inches or 133.3 mm). 1HP (0.2 inches or 5.08 mm), where width "HP" is measured in horizontal pitch units. A card width is generally integer multiples of 1HP, although some manufactures work in multiples of 0.5HP.

  8. Wire gauge - Wikipedia

    en.wikipedia.org/wiki/Wire_gauge

    No. 7/0, the largest size, is 0.50 inches (500 mils or 12.7 mm) in diameter (250 000 circular mils in cross-sectional area), and the smallest, No. 50, is 0.001 inches (1 mil or 25.4 μm) in diameter (1 circular mil [cross-sectional area] or 0.7854 millionths of a square inch).

  9. Electrical length - Wikipedia

    en.wikipedia.org/wiki/Electrical_length

    The phase velocity at which electrical signals travel along a transmission line or other cable depends on the construction of the line. Therefore, the wavelength corresponding to a given frequency varies in different types of lines, thus at a given frequency different conductors of the same physical length can have different electrical lengths.

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