Has no suggestions to improve photographs. Wants to determine whether the degradation of light from center to edge of sun is 'real.' Does not think sun's size affects focus.
Showing 1–5 of 5 items
Has no suggestions to improve photographs. Wants to determine whether the degradation of light from center to edge of sun is 'real.' Does not think sun's size affects focus.
Discusses 'autograph of the sun' he sent earlier. Discusses measuring relative temperature of sun. Has an unpublished letter of Galileo to Cardinal Barberini regarding sunspots.
Discusses Galileo's unpublished letter on sunspots. Outlines comparisons between tropical storms and sunspots as discussed at Cambridge Philosophical Society. Wishes to meet [Frederick] Howlett to discuss sunspots.
Sends series of solar heliographs. If further suggestions for improvement of these are noted, please send them. Is preparing to photograph Dec. 31 eclipse.
Detached postscript discussing sunspots, comparing them to the low barometric pressure center in cyclones. J. S. Henslow is dying.