The vernier

All Cassens & Plath sextants are equipped with a vernier, which enables a reading accuracy of one tenth of a degree or minute. The following example explains how to read the sextant's vernier correctly (larger images can be opened on the right side):

 0° position

1° position

after an exact 360° turn of the vernier

Example for 0°39,7'

The upper line (with a dot) of the right-hand scale

indicates the whole minute of the left scale.

In this example 39'.

The decimal value is read from the right-hand scale

where both scale lines form a line (in this example 7).
Tags: Sextant, Nonius

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