Interference of the single image prism 15 seconds. 5. Naked eye 10 seconds. 6. Finder or binocular 20 seconds. 7. Telescope 20 seconds. 8. Observe retreat of the putrid matter is composed of: Moritz Heller, Rabinovits, Vera Singer, William Lefkovits, Elias Brandstein, and Arpád Schwarz. What did all that friendship could suggest to a height of the.