Usually orange or red spot composed of droplets containing carotenoids. Found near photo
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A paired stalk arising close to the median line on the dorsal surface of the head of many Crustacea, bearing an eye.
A correction applied in precise work to the average angle of elevation read on the vertical circle, in order to compensate for the vertical axis of the theodolite not being truly vertical. The correction is where Z=object-end reading of the altitude level, Xt.=eye-end reading of the altitude level, and 0=angular value of one division of altitude level,
The fundus; that part of the cavity of the eyeball which can be seen through the pupil with an ophthalmoscope,
Jet engine thrust-reverser nozzle deflectors, shaped and closed like eyelids,
In an optical instrument, the lens or lens system to which the observer's eye is applied in using the instrument.
Grid incorporated in the eyepiece for measuring objects under the microscope. Special type used in particle-size analysis consists of a rectangular grid for selecting the particles and a series of graded circles for use in sizing the particles. Also micrometer eyepiece. US ocular micrometer.
A formula proposed for the period of reverberation of an enclosure, taking into account that the sound waves lose energy every time they are reflected. The results are not identical to those of the Sabine reverberation formula.