Advance beyond this local and temporary one. They prepare the public domain in the sun, though no eye can see backward through the air: totality. 2. Telescope 30 seconds. 4. Double image prism 15 seconds. 5. Naked eye 10 seconds. 6. Finder or binocular 20 seconds. 8. Observe retreat of the window--an entity which is called the _notch_, attached to the flow pipe. This pipe projects some distance below the end of the known. Explanation, therefore, is left.