100 -inch Hooker Telescope
TOTAL WEI GHT OF THE TELESCOPE OS ABOUT 100 TONS.
THE MIRROR IS MOUNTED IN THE LOWER END OF THE TELESCOPE.
IT IS 100 INCHES IN DIAMETER, 13 INCHES THI CK AT THE
OU TER EDGE, AND WEI GHS 4 TONS. THE UPPER CONCAVE SUR•
FACE IS COVERED BY A THIN BUT BRILLI ANT COAT OF ALUMINUM
AND FOCUSES THE LI GHT OFA STAR IN THE SAME WAY AS A LENS.
MOUNT WILSON AND PALOMAR OBSERVATORIES PHOTO GRAPH
PC 13
E 47 27
