11. Once the instrument was properly adjusted, a photographic plate was inserted and exposed. 12. The flying-spot store used a photographic plate as the store of binary data. 13. Astrographs using astronomical photographic plates sped the process in the early 20th century. 14. The program's nearly 7, 000 photographic plates are now archived at Lowell Observatory. 15. However, despite that, well-wrapped photographic plates at an adequate distance weren t exposed. 16. Blinking two photographic plates enabled a person to spot the differences. 17. Photographic plates were taken with the ESO's 1-meter Schmidt Telescope at La Silla.18. The subject and the photographic plate holder were similarly supported within the sandbox. 19. Several astronomers at Hamburg observatory took more than 1700 photographic plates . 20. This allowed creating more sensitive photographic plates than previously possible.
