Cassens & Plath Sextant PROFESSIONAL Clear-view mirror

‌Sextant frame and construction

The frame is made from a 5.5 kg brass plate, which is milled to produce a frame weighing approx. 0.6 kg. Once the milling work is complete, the frame is heated in a furnace, straightened, ground and engraved. The individual components are then assembled. Once manufactured, the sextant consists of over 100 individual parts, most of which are produced in-house. All components are assembled and adjusted by hand. Each sextant is tested after manufacture and a quality certificate is issued.

Clear-view mirror

The sextant is equipped with a clear-view mirror. This was developed by Cassens & Plath and features a special design: the central vertical part of the clear-view mirror is half-silvered and therefore semi-transparent, while the side edges are not mirrored and offer an unobstructed view of the horizon. This means that the side areas provide an unobstructed and unobscured view of the horizon, while the centre zone allows both the celestial body and the horizon to be seen at the same time. This has the advantage that, in good light conditions at sea, both during the day and at night, optimal observation conditions prevail and the celestial body can be kept in view more easily, even in rough seas. This simplifies measurement. The clear-view mirror thus combines the advantages of the split-view and full-view mirrors without any of their respective disadvantages.