This took photographic plates in blue light of the entire southern sky.

Every time there were two lines achieved on the photographic plate.

Before the 1990s, photographic plates were most common in astronomy.

An electron makes a path of light across a photographic plate.

This involved the taking and measurement of 1400 photographic plates.

Since the early 20th century, measures have been made with photographic plates.

It was the first successful process for producing color images from a single photographic plate.

In the early days of the 20th century he used photographic plates, like all other serious photographers.

The photographic plate on the table before him was blank.

The marks of my fingers begin to come out slowly, like a photographic plate being developed.