6.5-inch concave speculum mirror

Date: 1850-1900

Inventory Number: 2007-1-0284

Classification: Mirror

Subject:

optics, astronomy,

Maker: English ?

Maker: American ?

Cultural Region:

United States, England,

Dimensions:

4.2 × 16.7 × 16.8 cm (1 5/8 × 6 9/16 × 6 5/8 in.)

Material:

speculum metal,

Description:

Speculum metal mirror with black paint on back and sides. It is attached to a stem with a round base. The base has a central hole to accept a shaft. There are two opposing locking screws on the base.

Signedunsigned

Curatorial RemarksTag says that focal length is 7 cm.