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cross-staff
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cross-staff navigator's cross-staff
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Submerged sperm whale off east Sri Lanka coast, mammal
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earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.
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Illustration by the CDC, reveals ultrastructural morphology exhibited by coronaviruses. Note the spikes on the outer surface of the virus, which impart the look of a corona surrounding the virion, when viewed electron microscopically. A novel coronavirus,
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cross-staff

measurement instrument

Learn about this topic in these articles:

use in navigation

  • officer using charts for navigation
    In navigation: Latitude measurements

    …than its 16th-century successor, the cross-staff, a simple device consisting of a staff about 3 feet (1 metre) long fitted with a sliding crosspiece (see photograph). The navigator, holding the staff to one eye, would move the crosspiece until its lower end coincided with the horizon and its upper end…

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