glass blank
Date: early 20th Century
Inventory Number: 2007-1-0031
Classification: Mirror Blank
Maker: American
User: Harvard College Observatory ? (founded 1839)
User: Radcliffe College (1894 - 1999)
Cultural Region:
Dimensions:
3.9 × 10.2 × 10.2 cm (1 9/16 × 4 × 4 in.)
Material:
Description:
This glass blank is a thick cylindrical piece of glass. The front side is polished and appears flat. The reverse side is fire-polished and unfinished. There is an old numerical inscription on the back. A groove separated the rear section from the larger front section.
Signedunsigned
Inscribedin black crayon on unfinished side of blank: 3 / CONCAVE
inscribed on unfinished side: 21- B - 4 / #184
on sticker: from / Byerly / 10/13/64
inscribed on unfinished side: 21- B - 4 / #184
on sticker: from / Byerly / 10/13/64
Curatorial RemarksFrom the inscription, it was probably meant to become a concave lens or mirror.
ProvenanceTransferred from the laboratory of Radcliffe College in 1964.