x-library. published 1922. Hardback. A few pages seperating from binding but in other wise nice condition. There is a 1 inch tear on outside of backing at top w/a little fraying top and bottom of backing. Cover good except some spotting on lower right of back.
Lots of diagrams and descriptions of early 20th century telescope and optic design. Someone who likes to impress their friends with a nice library would like it. Others might find it a great reference.
Please make offer. I don't know it's value.