[ATM] telescopes by Gerry Logan

[Peter Abrahams <telscope@europa.com>]

Gerry Logan is a telescope maker in the LA area who has displayed at the 
Riverside Telescope Maker's Conference for about 3 decades.  He is a retired 
professional optical fabricator, and uses unusual optical systems and machined 
mounts.  He does not design the optics; but often uses Walt Goldys for design 
work; and the Schupmann designs are from Jim Daly's books.  I borrowed his 
collection of photos & slides showing his telescopes, scanned them, did some 
basic optimization, and posted them on line, at:
http://siderealtechnology.com/atm/Logan,Gerry/
--This is not a html web page, just a directory of files.
--There are 18 telescopes in the directory; plus mounts, and images of some 
instructional pages.  175 images, total 36 megabytes.
--The images belong to Gerry, and his permission is needed to republish them.
--Gerry said that he's willing to talk to ATMs interested in his work.  Email me 
for his phone number.  He does not use a computer or email.
--There are several telescopes, his first, that are not shown.  Photos of these 
were loaned out and have not yet been returned.  If someone on the list can 
contact Rick Shaffer (spelling?), who volunteered at RTMC for years, and now 
probably lives in Arizona.... please ask him to mail the photos to Gerry.
--Gerry says that the Schupmann requires the most precision in fabrication, with 
tight tolerances, and very little room for errors; but he feels it provides the 
best correction among the various designs and is his 'favorite'.
--Thanks very much to Dan Gray & Sidereal Technology (who make servo drives for 
amateur telescopes), for providing web space for these photos.

Gerry is currently working on 5 telescopes:
-10 inch f12 Schmidt Cassegrain, Walt Goldys design, with Ross doublet 
correcting lens.
-8 inch f5.5. Newtonian Maksutov
-10 inch f15 Rumak, f4 primary with triplet corrector / barlow
-8 inch f10 Stevick Paul
-10 inch f6 Newtonian on a split ring mount

--Peter
=============================
Peter Abrahams   telscope@europa.com
The history of the telescope and the binocular:
     http://home.europa.com/~telscope/binotele.htm

_______________________________________________
ATM mailing list http://www.atmlist.net/