Telescope Data Center Harvard Plate Collection Harvard-Smithsonian Center for Astrophysics
Harvard Observatory Plate Stacks
MB Series Characteristics


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


Plate nos.LocationDates
1-1776Taunton and WInchester, Massachusetts? - 1914-05-22
2388-2722Cambridge, Massachusetts1929-07-11 - 1932-03-14


Plate SizeLocationNumbers
early 8x10, 4x5first floor, misc. cabinet2388-2722
8x10first floor, Patrol Series 12388-2722

Record Books:

MB were given the same plate number as the corresponding MA plate; see MA records (2) 1-3222
Online: [01] [02]

Record Sheets:

See early MA record sheets.


MB was used to denote plates taken with wide-angle riders on the 12-in M A:
0001-03274-in Cooke lensScale: 191"/mm
2388-27223-in Ross Lundin390"/mm
N.B.: Beginning 1934, Jan 29, the 3-in Ross Lundin was used for the BM series.