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Its chief features may be summarised as follows :—

1. It enables the surveyor, by means of a mirror, to observe the compass needle simultaneously with taking the sights above or below the horizontal.

2. There is no necessity for a staff or tripod, or for a second observer.

3. Great convenience in taking vertical angles.

4. Use as an ordinary clinometer.

5. It is constructed of magnalium weight, 10 oz. (280 grammes), and of such a size and form, 3 in. by If in. (76 by 30 mm.), as to go conveniently into the pocket.

6. The needle being of the bar form, is much steadier and more accurate than with a ring or card attached.

7. The graduated horizontal circle is furnished with a screw to admit of adjustment for magnetic deviation at place of use.

Drawing Instruments.

A set of the best English made drawing instruments, in case.

Nautical.

A Nautical Sextant of great rigidity and strength known as the “Pillar ” pattern, on a tripod stand, with every possible adjustment.

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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 98,89 %.

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

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