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  2. Topographic Abney level - Wikipedia

    en.wikipedia.org/wiki/Topographic_Abney_Level

    In 1914 and 1915, the Forestry Quarterly published a series of articles on the use of the Abney level. [6] [7] [8] These tutorial articles remain useful today, but the primary reference for usage is the 1927 Abney Level Handbook. [3] The Abney level is typically used at the eye height of the surveyor, either hand-held or mounted on a staff at ...

  3. Inclinometer - Wikipedia

    en.wikipedia.org/wiki/Inclinometer

    The Abney level is a handheld surveying instrument developed in the 1870s that includes a sighting tube and inclinometer, arranged so that the surveyor may align the sighting tube (and its crosshair) with the reflection of the bubble in the spirit level of the inclinometer when the line of sight is at the angle set on the inclinometer.

  4. Lotfernrohr 7 - Wikipedia

    en.wikipedia.org/wiki/Lotfernrohr_7

    Arado Ar 234, The sight window of the Lotfe 7 is visible under the fuselage, ahead of the front leg of the landing gear. Operation was fairly similar to the Norden. The bombardier would first locate the target in the bombsight and continue to adjust the dials until it remained motionless in the eyepiece. This allowed the bombsight to calculate ...

  5. Man-portable air-defense system - Wikipedia

    en.wikipedia.org/wiki/Man-portable_air-defense...

    The missiles are about 1.5 to 1.8 m (5 to 6 ft) in length and weigh about 17 to 18 kg (37 to 40 lb), depending on the model. MANPADS generally have a target detection range of about 10 km (6 mi) and an engagement range of about 6 km (4 mi), so aircraft flying at 6,100 metres (20,000 ft) or higher are relatively safe.

  6. Stadimeter - Wikipedia

    en.wikipedia.org/wiki/Stadimeter

    The hand held stadimeter was developed by Bradley Allen Fiske (1854–1942), an officer in the United States Navy. It was designed for gunnery purposes, but its first sea tests, conducted in 1895, showed that it was equally useful for fleet sailing and for navigation.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. List of amateur radio transceivers - Wikipedia

    en.wikipedia.org/wiki/List_of_amateur_radio...

    The transceiver can transmit and receive on the HF 10-, 15-, 20-, 40-, 80- and 160-meter bands, [33] and can receive WWV and WWVH on 15 MHz. It can use SSB , FSK and CW on all bands. [ 33 ] The TS-820S' power consumption is 57 watts (with heaters on) when receiving and 292 watts when transmitting.

  9. Survey meter - Wikipedia

    en.wikipedia.org/wiki/Survey_meter

    Survey meters in radiation protection are hand-held ionising radiation measurement instruments used to check such as personnel, equipment and the environment for radioactive contamination and ambient radiation. The hand-held survey meter is probably the most familiar radiation measuring device owing to its wide and visible use.

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