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Cole quadrant

1

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Engineering, Manufacturing and Construction

Metroloogia terminibaas

ID 1199506 Last modified 15.10.2026
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Domain metrologymeasuring instruments
Cole kvadrant former
Cole quadrant former
  • mõõtevahend, mis koosneb varrest, mille ühes otsas on pööratav kvadrant, ja kvadrandi jaotustega skaala ülemises otsas asub varjuandev sihik, kuhu on paigaldatud lääts, mis heidab horisondisihikule varju või projitseerib sinna päikesekujutise
  • measuring instrument consisting of a rod with a rotatable quadrant at one end; at the upper end of the scale - which features the quadrant’s graduations - there is a shadow-casting sight fitted with a lens that casts a shadow onto the horizon sight or projects an image of the sun onto it
Cole kvadrant former
Usage examples
  • Cole kvadrantiga mõõtja jälgib horisonti läbi sihikul oleva ava ja horisondisihikus oleva pilu, tagades nii kvadrandi horisontaalse asendi. Seejärel kvadranti pööratakse seni, kuni horisont ja päikesekujutis (või vari) kattuvad ning seejärel saab kvadrandi skaalalt lugeda kõrgusnurga väärtuse. Asjaolu, et Cole kvadrant võeti kasutusele 18. sajandi keskel, näitab, et see kvadrant oli isegi oktandi olemasolu ajal endiselt toimiv ja kasutuskõlblik mõõtevahend.
Cole quadrant former
Usage examples
  • The user of a Cole quadrant observes the horizon through an aperture in the sight and a slit in the horizon sight, thereby ensuring the quadrant is held horizontally. The quadrant is then rotated until the horizon and the image (or shadow) of the sun coincide, at which point the angle of elevation can be read from the quadrant's scale. The fact that the Cole quadrant was introduced in the mid-18th century indicates that it remained a functional and practical measuring instrument, even after the advent of the octant.

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