Prism level

€203.00

Tilting of the Sextant can be recognized immediately
For Subsequent mounting
For all Cassens & Plath sextants with full-view mirror

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Available, delivery time: 5 days

Product number: 44100w

The vertical level consists of a glas prism, which can be mounted subsequently.

In case of tilting the sextant the horizon that is visible through the prism is not in line with the real horizon.

Tilt errors of the sextant

The measurement error at 5° inclination and 45° celestial altitude is e.g. 7sm

1) To avoid this, the sextant was swiveled around the telescope axis until now.
The star describes an arc over the horizon. The lowest point of this arc is the correct celestial altitude.

2) The vertical reference is a glass prism.
When the sextant is tilted, the horizon line seen through the prism, appears offset from the one seen directly. The measurement is then correct
if the eyepiece line passes through the field of view without step/offset.

Colour:	Black, White

1 x Prism level

Prism level

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