THE TELESCOPE
McGraw-Hill Book Co. Inc.
PUBLISHERS OF BOOKS FOR
Coal Age ▿ Electric Railway Journal
Electrical World ▿ Engineering News-Record
American Machinist ▿ Ingeniería Internacional
Engineering & Mining Journal ▿ Power
Chemical & Metallurgical Engineering
Electrical Merchandising
Galileo’s Telescopes. (Frontispiece)
(Bull. de la Soc. Astron. de France.)