146

Special attention is drawn to the well-designed rackwork adjustment; the principle is that of a differential screw, giving a smooth motion, which can be worked by one finger. Being unaffected by the continual wear and tear, it does not give rise to any slackness. One eyepiece is separately adjustable for unequal vision, and the bodies are hinged for interpupillary distance.

The " Minim” is constructed of a special light metal alloy, well japanned; and the bodies are covered with dark green Russia leather. It is supplied with a small sling strap to carry the glass round the neck when not in use.

Compasses.

An assortment of night marching, touring, luminous, and pocket compasses.

Microscope.

A Microscope of the highest accuracy and finish.

Sun Dial.

The “ Helio-Chronometer” an instrument for giving the correct local mean time to the fraction of a minute.

By means of an accurately shaped cam, automatic correction is made for the " Equation of Time.” This is done by setting the rotating part of the instrument to indicate the day of the year on which the observation is being made.

---

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 99,36 %.

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

---