. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. ,730,000 miles 23 iniles per sec June 6 2,200,000 miles 27 miles per sec. May 26-27 2, miles 24 miles per sec. May 30-31 6,600,000 miles 45 miles per sec. June 7-8 8,400,000 miles 57 miles per sec. The points to be measured were not well defined, and themeasures could not be accurate, but it is clear that high speedsand accelerated speeds prevailed. The tail materials start outslowly from the head, and increase their spe
. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. ,730,000 miles 23 iniles per sec June 6 2,200,000 miles 27 miles per sec. May 26-27 2, miles 24 miles per sec. May 30-31 6,600,000 miles 45 miles per sec. June 7-8 8,400,000 miles 57 miles per sec. The points to be measured were not well defined, and themeasures could not be accurate, but it is clear that high speedsand accelerated speeds prevailed. The tail materials start outslowly from the head, and increase their speeds with thedistance from the head, as we should expect of motion result-ing from the action of a continuous force which meets with nsensible resistance. In Plate XI are reproductions of photographs of Halleyscomet made by Curtis on June 6 and June 7, 1910. A semi-detached part of the tail, seen on the photograph of June 6about an inch atove the head, is visible alx)ut two and a halfinches above the head on the photograph of June 7. Thisstructure was first observed by Curtis shortly after it hademerged from the central part of the head on June 4, and it. ,\ \ \ 1\ ^^ ^^ l|p\^ ^M ^P x_\ X ^- ^^ R\^. \ -Jj R\ 1 RI-I-. 1 I X |,x ^ H 1 J 1 \^^ x\ 4 1 > \ \ 1 PLATE IX. Comet on July 12 and Tcly 13, 1893. Photographs by JV. J. camera followed the nucleus of the comet, and the trailed. \\iiAT We Know 41 -L Mt. ;Ba<uilton .476 Cordoba Christchurch, was recorded on the photographs secured by a great manyobservatories in the following four days, as the rotation ofthe Earth brought the comet successively into position forobservation at the different observatories. The times when thelower point of the structure had certain positions are indicatedin Fig. 3. The tail did not seem , to lag behind the position of theradius vector—the line passingthrough the Sun and the cometsnucleus—because the observers onthose days were n
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19
