Box Sextant

1973/015

2 in box sextant

SKU: 1973/015 Categories: ,

Description

2 in box sextant in bronzed brass with plane sight reading to 1 minute of arc (telescope missing). Cover with threaded mount for staff or handle.

Box sextant is used for observing and setting out angles up to 120°. In principle it is the same as an optical square except that the user can adjust the angle by rotating one of the mirrors. The instrument can be fitted with a small telescope for long distance sightings.

Used for measuring horizontal angles often in conjunction with ranging rods where the accuracy of a theodolite is not required.

Additional information

Acquisition Number

1973/015

Item Type

Short Description

Box Sextant

Manufactured by

Date of Manufacture

c. 1900

Sub-items

None

Supporting Items

None

Makers Number

None

Marks

"OS1"

Dimensions (mm)

83 (dia) x 55 (H) (excl magnifier)

Donor

Date Donated

March 1973

Materials

Bronzed brass and glass

Condition

Fair: telescope is missing

Display Location