green filter
Date: 1900-1940
Inventory Number: 2007-1-0041
Classification: Filter
Subject:
Manufacturer: Central Scientific Company (1889 - 2000)
Cultural Region:
Place of Origin:
Dimensions:
5.6 x 6.5 x 1 cm (2 3/16 x 2 9/16 x 3/8 in.)
Description:
Small color filter that only let light from the green part of the spectrum pass through (hence the inscription).
Signedin white letters, stamped on filter frame: CENCO FILTER / NO. [numerals penned in yellow] / Central Scientific Co.
Inscribedstamped in white, with part number handwriten in yellow: CENCO FILTER / NO. 87308Gr
in pencil on front of filter frame: #7 / 550 mu
in pencil on back of filter frame: 550 mu cen[torn paper] / pass 540-565
in pencil on front of filter frame: #7 / 550 mu
in pencil on back of filter frame: 550 mu cen[torn paper] / pass 540-565