File:The century illustrated monthly magazine (1882) (14770194785).jpg

Identifier: centuryillustratv32newy (find matches)
Title: The century illustrated monthly magazine
Year: 1882 (1880s)
Authors:
Subjects: American literature
Publisher: New York : Century Co.
Contributing Library: Lincoln Financial Foundation Collection
Digitizing Sponsor: The Institute of Museum and Library Services through an Indiana State Library LSTA Grant

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
here dome of the same diameter broad aisle under the framework, which haswould rest on a tower having a circumference a floor surface of two thousand square feet,,of two hundred and seventeen feet. The the seven-eighths dome will contain muchtower would need be of enormous strength to more spare room than a dome on the ordinarycarry the weight, and the friction in revolving plan furnished with a movable ladder-chair,the dome would offer a resistance over one The aisle will afford room for an astronomical hundred per cent, greater than the seven-eighths sphere. For the seven-eighths sphere,which is likely to be adopted, unless some fataldefect not yet revealed shall in the mean timebe detected, the external tower will be raised library, for visitors and other purposes, with-out interfering with the working of dome,chair, or shutter, as would be the case in othersystems. The observer in the Lick dome willbe able to perform all His work at the eye-piece 68 A CALIFORNIANS GIFT TO SCIENCE.
Text Appearing After Image:
NORTH DOME, FROM THE ROOF OF THE OBSERVATORY. (FROM A PHOTOGRAPH BY H. E. MATHEWS.) of the great telescope free from intrusion orinterruption, and he will be saved the fatigueand loss of time incurred in ascending anddescending a ladder-chair thirty feet or morein height. The dome will weigh fifty tons.It will roll on an endless harnessed carriage.The sole and bed plates will be perfectly pro-tected from any variations of temperature, sothat there will be no trouble from expansionand contraction. The following table showsapproximately the ratio of quantity of mate-rial, cost, and resistance to motion of a hemi-spherical dome compared with a seven-eighths sphere, both being sixty-five feet inside diam-eter : y2 sphere. 7/% sphere. Quantity of metal I i.i Quantity of masonry I .59 Cost of metal... 1 1.26 Cost of masonry 1 .61 Total cost of dome 1 .915 Total weight above rollers I 1.35 Length of track in one revolution. . 217 feet 75 feet Resistance to motion 1 .46 Shutter, chair, and do

Note About Images