Harvard Plate Stacks BM Series

Harvard-Smithsonian Center for Astrophysics
Harvard Observatory Plate Stacks
BM Series Characteristics

Basics

Plate Size	Plate Scale	Telescope	Focal Length
8x10	391"/mm	3-inch Ross Fecker	21 inches

Observatory

Plate nos.	Location	Dates
1-3222	Cambridge, Massachusetts	1934-01-30 - 1941-02-05

Filed

Plate Size	Location	Numbers
8x10	first floor, Patrol Series 1	all

Record Books:

(2) 1-3222
Online: [01] [02]

Comments:

Instrument moved to Mexico, February 7, 1941.

Plates 1-410 were taken with the 3-in Ross-Lundin lens previously used for the MB series (which see).

Plates 411 ff. were taken with a 3-in Ross-Fecker lens. Two new Ross-Fecker lenses were tested, with numbers in this series in February 1937. The first plates were taken with the BM on the old 8-in I mount in Cambridge until this was reclaimed by the I in October 1934.