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  • Classification / Category: Filter  
  • Classification / Category: Mirror  
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American (55)
Wild Heerbrugg Instruments Inc. (33)
Wild Heerbrugg Ltd. (33)
Harvard College Observatory (16)
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French (10)
English (9)
Eastman Kodak Company (8)
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Classification / Category *

Filter (84)
Mirror (74)
Reflector (2)
Camera Accessories (1)
Comparator Accessories (1)
Exposure Meter (1)
Eyepiece (1)
Manometric Flame Apparatus (1)
Microscope (1)
Microscope Light Source (1)
Optical Accessory (1)
Photographic Filters (1)
Spectacles (1)
Transformer (1)
Welder's glass (1)

Collections

Wild M20 Compound Microscope (33)
Exhibit 2005--CHSI's Putnam Gallery (6)
Transit of Venus (3)
Exhibit 2008--The Matter of Fact (2)
radio (2)

Date

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2 frosted glass disks

2 frosted glass disks

American
1910-1940
2-inch concave telescope mirror

2-inch concave telescope mirror

English
1800-1850
2 neutral density filters

2 neutral density filters

Globe Optical Company
1900-1920
2 neutral density filters

2 neutral density filters

American
1910-1940
3 neutral density filters for telescope eyepiece

3 neutral density filters for telescope eyepiece

English
1850-1900
4.1-inch flat heliostat mirror

4.1-inch flat heliostat mirror

American
mid 20th Century
4.6-inch concave mirror

4.6-inch concave mirror

American
1950-1970
5.6-inch concave speculum mirror

5.6-inch concave speculum mirror

English
1850-1900
6.5-inch concave speculum mirror

6.5-inch concave speculum mirror

English
1850-1900
6.5-inch concave speculum mirror

6.5-inch concave speculum mirror

English
1850-1900
6-inch, f/8 concave telescope mirror

6-inch, f/8 concave telescope mirror

American
circa 1960
7.25-inch concave speculum mirror

7.25-inch concave speculum mirror

English
1800-1850
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