0.25-inch refracting telescope
Date: 1790-1820
Inventory Number: DW0974
Classification: Telescope
Subject:
Maker: English ?
Cultural Region:
Dimensions:
fully extended: 3.8 × 3.8 × 43.6 cm (1 1/2 × 1 1/2 × 17 3/16 in.)
closed: 3.8 × 3.8 × 27.4 cm (1 1/2 × 1 1/2 × 10 13/16 in.)
Description:
This small spyglass is made of wood and brass. The objective lens is 1 1/8 inch (2.7 cm) in diameter, but has an aperture stop behind it similar to those found on very early telescopes. The opening is only 1/4 inch (.7 cm) in diameter!
There is one draw tube. It consists of three segments screwed together. Each segment has a lens.
The eyepiece has no lens, and is a tapered column with a sliding cover. The eyepiece is threaded like the draw tube sections and can be attached to any of them.
The wood has lost its stain and varnish.
There is one draw tube. It consists of three segments screwed together. Each segment has a lens.
The eyepiece has no lens, and is a tapered column with a sliding cover. The eyepiece is threaded like the draw tube sections and can be attached to any of them.
The wood has lost its stain and varnish.
Signedunsigned