Eikonometer

The eikonometer should then be applied to the eyepiece and the size of the object read off on the eikonometer scale as millimetres, and the actual size calculated by dividing the observed size by the magnification constant for the particular optical combination employed in the observation. ❋ Unknown (N/A)

_ -- In the case of non-motile or sluggishly motile organisms, endeavour to measure several individuals in each hanging drop by means of the eyepiece micrometer or the eikonometer (_vide_ page 63), and average the results. ❋ Unknown (N/A)

Observation through the eikonometer shows its micrometer scale superposed on the image of the stage micrometer. ❋ Unknown (N/A)

Rotate the eikonometer until the lines on the two scales are parallel, and make the various adjustments to ensure that two lines on the eikonometer scale coincide with two lines on the stage micrometer. ❋ Unknown (N/A)

For the sake of illustration it may be assumed that five of the divisions on the stage micrometer accurately fill one of the divisions of the eikonometer scale; this indicates a magnifying power of 500 as the constant for that particular optical combination, and a record should be made of the fact. ❋ Unknown (N/A)