High Power Binocular Eyepiece.

No. 3781 No. 3780

This binocular eyepiece is made in a form which replaces the ordinary eyepiece so that a monocular microscope can be converted into a thoroughly efficient binocular instrument. It is well known that the use of the two eyes for microscopic observation prevents fatigue and improves the quality of vision. With a binocular the perceptive faculties are more constant during prolonged observation than with a monocular, and with the latter, the detection of fine detail is less certain. Often however where the worker has already a satisfactory and probably expensive monocular microscope, he is disinclined to dispose of it and purchase a new complete binocular microscope. The Beck binocular eyepiece solves the problem. It has all the qualities of the binocular bodies which are built into microscopes, but is made in a form which permits it to be inserted into any microscope. It can be used with all powers and with any standard objectives, and any eyepieces of the standard (-917") size.

The optical construction consists of a prism composed of two right angled prisms cemented together which receives the light from the object glass. The cemented surface has a thin semi-transparent layer of silver. This divides the light into two complete bundles, one of which is directed into each eye. As the full aperture of the object glass is used in each eye, the resolution is unimpaired.

The two tubes of the binocular are inclined at the normal convergence for near objects. The principle of converging tubes in binocular microscopes is discussed on page 45 in connection with our other forms of binocular bodies and applies in the same way to the binocular eyepiece.

The interocular distance is variable from 47 to 78 millimetres, and is adjusted by turning the two tubes on a common centre, the tubelength remaining unaltered.

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Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 99,79 %.

La langue de reconnaissance de l'OCR est l'Anglais.

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