English: Drawing of the James Lick telescope at Lick Observatory, Mt. Hamilton, California, USA, from 1888 astronomy book. Built between 1876-1888, it is an antique 36 inch (91 cm) aperture refractor, the second largest refracting telescope in the world. The focal length (the approximate length of the tube) is 56 ft. 2 in. (17.11 m). The telescope was used by actually looking through the eyepiece in the center of the end of the tube. Astronomers used the stepladder visible in the background, and the catwalks on the building, to reach the eyepiece. In addition, the floor of the building could be raised pneumatically for this purpose. Alterations to image: cropped out caption and frame, brightened image slightly, rotated slighly to make image vertical, converted to 48 grayscale PNG.