Amateur Telescope Making, Book One, 1926 Amateur Telescope Making, Advanced, 1937 Amateur Telescope Making, Book Three, 1953
Published by Scientific American, edited by Albert (Pop) Ingalls.
I recently purchased a set of first editions in mint condition through a rare book locator. They were very pricey!
Willman-Bell Publishing has purchased the rights to this series and is preparing a modern edition, which they anticipate will be in two volumes that will sell in the hundred dollar range.
You can occasionally find individual used volumes of later editions at swap meets and in the Starry Messenger. I have also checked out copies at my local library using the Interlibrary Loan System.
-- Steve Strickland Lensnut@tpoint.net