Achromatic Dual-Power monocular - Brass, Glass, Mahogany - Late 18th century

Description
Achromatic Dual-Power monocular - Brass, Glass, Mahogany - Late 18th century
Great Britain

Rare achromatic Dual-Power monocular with originally store sleeve from the end of the 18th century. Monocular does have some wear, including some small shrinkage cracks in the mahogany shell. Viewer still works very well and gives a nice sharp image.
Sleeve is made of cardboard covered with a kind of canvas.
See also the pictures for the condition.

Operation monocular:
This monocular has two eye lenses in the eye piece. The eyepieces can be used one by one by rotating the eyepiece, making the necessary lens appear. On the brass tube of the viewer are two engraved lines, if the eyepiece and the viewer are pushed to the correct line, this gives the viewer a proper magnification and a clear picture (the lenses probably give a magnification of 3 and 6 x)
Monocular is not signed, but is of high and heavy quality. Special feature of this one is that it has a mahogany shell, most of such monoculars are completely made of brass.

Dimensions:
Length 10 cm
Length extended 15 cm
Diameter 4 cm.
The monocular will be packaged with care and shipped with registered mail.

Lot details
Object
Achromatic Dual-Power monocular
Material
Brass, Glass, Mahogany
Estimated Period
Late 18th century
Country of Origin
Great Britain
Condition
Good condition - used with small signs of aging & blemishes
Weight
200 g
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