demonstration of Tolles fine-focus nosepiece
Date: 1860-1874
Inventory Number: 1045g
Classification: Workshop Tool
Subject:
Maker: Robert B. Tolles (1823 - 1883)
Maker: Boston Optical Works (fl. 1867 - 1895)
Maker: Charles X. Dalton (1840 - 1912)
Cultural Region:
Dimensions:
6.9 × 2.7 × 2.7 cm (2 11/16 × 1 1/16 × 1 1/16 in.)
Description:
1045g is a Tolles workshop pattern or demonstration model.
It demonstrates the method used by Tolles and Dalton in the fine focus of their objectives by means of threads in the nosepiece.
The model is made of brass and nickel. It has exposed threads and a rotating collar.
An old tag reads: "Tolles fine / adjustment: -- / Presented by / Mr. Chas. X. Dalton / Feb. 15, 1901."
A later tag was added by David P. Wheatland and describes the mechanism.
(The item is currently stored in parts box 1045a.)
It demonstrates the method used by Tolles and Dalton in the fine focus of their objectives by means of threads in the nosepiece.
The model is made of brass and nickel. It has exposed threads and a rotating collar.
An old tag reads: "Tolles fine / adjustment: -- / Presented by / Mr. Chas. X. Dalton / Feb. 15, 1901."
A later tag was added by David P. Wheatland and describes the mechanism.
(The item is currently stored in parts box 1045a.)
In Collection(s)
Signedunsigned
Inscribedon tag: Tolles fine / adjustment: -- / Presented by / Mr. Chas. X. Dalton / Feb. 15, 1901.
Historical AttributesGift of Charles X. Dalton, longtime partner and successor to Tolles, in 1901.
ProvenanceTolles - Dalton workshop.