The original version from Paton Hawksley.
Three gratings of, respectively, 100, 300 and 600 lines/mm,
mounted between parallel glass plates in a 90 x 30 mm cardboard frame.
(The mid-size grating is actually 7,500 l/inch = 295.27 l/mm).
Each grating has an area of 9 x 16 mm.
(Art 1003082)
Three gratings of, respectively, 100, 300 and 600 lines/mm,
mounted between parallel glass plates in a 90 x 30 mm cardboard frame.
(The mid-size grating is actually 7,500 l/inch = 295.27 l/mm).
Each grating has an area of 9 x 16 mm.
(Art 1003082)
Properties
- F326000
- 842355,112355