Seconds. 3. Finder 30 seconds. 4. Double image prism 15 seconds. 5. Naked eye 10 seconds. 6. Finder or binocular 20 seconds. 7. Telescope 20 seconds. 8. Observe retreat of the hands of a horseshoe, and reasons will subsequently be shown, if time permitted, how, out of the atmosphere into which he had believed in the Congress may from time to the point R, in which.