Ocular Micrometer


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Ocular Micrometer

 

a built-in micrometer in the eyepiece (ocular) of a microscope, geodetic instrument, or astronomical instrument. It is used for exact measurements of small linear and angular distances and for increasing the accuracy of sighting in theodolites. A filar micrometer is most often used as an ocular micrometer.

References in periodicals archive ?
After calibration variables like cellular diame- ter(CD) and nuclear diameter (ND) of the 25 cells in each smear were measured by using calibrated ocular micrometer fixed in eye piece of microscope on 40 x (Fig 1).
In view of the exponential technological progress and, besides the tedious and monotonous use of the ocular micrometer, make the use of the instrument in question disappearing especially with the advent and, the generalization of high performance microscopes.
Measurements were done using an ocular micrometer in a stereoscopic microscope at a magnification of 15X.
Part 2 Basic Micrometry and Calibrating an Ocular Micrometer
For an index to age we measured the length of a 1st upper incisor (I1) along its lateral edge from the cingulum to the tip in ocular micrometer lines (= 0.033 mm each) on dermestid-cleaned skulls.
Without the use of an ocular micrometer, oocysts of Cyclospora might be easily confused with those of Cryptosporidium or other fecal artifacts that stain acid-fast positive, as was the case in a pseudo-outbreak of cyclosporiasis reported in Florida (6).
Oocysts were measured using a calibrated ocular micrometer and are reported in micrometers as means, followed by the ranges in parentheses.
Measurements were taken using an ocular micrometer and line illustration were made using a drawing tube attached to the compound microscope.
Ocular micrometer was calibrated with stage micrometer and used for the measurement of epithelial height with 40 X objective lens.
Beetle abdomens were macerated, and free sporophorous vesicles were examined under phase contrast microscopy at 400x magnification and measured with a calibrated ocular micrometer (n = 125).
The pollen was examined with a microscope (Olympus model BH-2), connected to a TV screen, measured with ocular micrometer at 1000X (using immersion oil).