Octant, Crichton and Son, London - Brass - Second half 19th century

Description
Octant, Crichton and Son, London - Brass - Second half 19th century
England

Octant by Crichton & Son, London ca. 1867-1870
In a nice used condition in the original triangular mahogany deck box with accessories.
An Octant from one of England's high-quality manufacturers, Crichton & Son from London. This instrument can be dated to the period around 1867-1870 on the basis that Crichton & Son had a business of making mathematical and nautical instruments at 112 Leadenhall Street London in 1867-1869 and at 11 Billiter Street London in 1870. The frame is a so-called "triangle frame" that has been used since the end of the 18th century.
The Octant has a silver degree arc inserted, is 24 cm long and has a practical measuring range of - 5 to 105 degrees. The vernier has a subdivision in seconds (from 0 to 15). Above the vernier is a loupe with a diffuser. Glass of loupe is damaged on the inside. Engraved on the arc: “Crichton & Son, London, Made for T. L. Ainsley, South Shields".
The frame is made of anodized brass to protect it against the elements at sea. There are small spots with light oxidation. The fitting is made of clear brass. Both the index mirror, horizon mirror, and filters are cool. There are two seekers. A glassless viewfinder, an approximately 2 x magnifying Galilei type viewfinder. In addition, a solar filter and an adjustment pin.
The box is in good condition (shrinkage crack below and small above) with nice fittings. Lockable with two hooks.
The octant will be shipped registered worldwide and will be very well packed.

Lot details
Object
Crichton and Son, London, Octant
Material
Brass
Manufacturer/ Brand
Crichton and Son, London
Estimated Period
Second half 19th century
Country of Origin
England
Condition
Good condition - used with small signs of aging & blemishes
Dimensions
6×22×24 cm
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