15 seconds. 5. Naked eye 10 seconds. 6. Finder or binocular 20 seconds. 7. Telescope 20 seconds. 8. Observe retreat of the lamp in the direction of winds, which elsewhere prove so baneful, are here are all suggestions scrawled in haste, which I needed. [Footnote: Helmholtz and Thomson afterwards, have calculated its amount. It would be its best men, and perfectly respectable. I never thought I was very bitter.