- Item type
- Object
- Makers
- Carston D. Ahrens
- Provenance
- Transferred from the Department of Geology & Mineralogy, Oxford, in 1961. Presented to the then Department of Mineralogy by Mrs N. Story-Maskelyne in 1911.
- Primary inscriptions
- C. D. Ahrens
- Other inscriptions
- Presented by Mrs. N. Story-Maskelyne, 1911 on a printed white label and 40 hand written on two stick on labels
- Dimensions
- Height: 63mm Width: 101mm Depth: 72mm Weight: 378g
- Inventory No
- 39106
- Accession Number
- 1961-138/13
Description
The instrument consists of two crystal prisms set in copper alloy brass a cylinders that push into blackened brass sleeves. These are mounted in a dovetail channel on a brass copper alloy plate, inscribed with the manufacturer's name. The inter-ocular distance between the sleeves can be altered by a mill edged knob on the other side of the plate which operates a rack and pinion for each mounting. The box case is covered with brown leather lined with purple velvet. The base is covered with stippled leather. There is a push stud catch at the centre of the front of the box case which is covered in black fish skin and lined with green velvet.
