Forty Years of AAAP History |
Our large refractor, which has been sitting unused for some time, has been recently restored to active service. At the September meeting of the AAAP, the writer was given the responsibility of moving the instrument from George Parker's farm and putting it in reasonable condition for use. George's station wagon and my car proved adequate for the task, and by Sept. 14th the basically fine but antique and neglected telescope was in my back yard.
The first order of business was to arrange, somehow, to have the instrument protected from the weather. It has been sitting exposed for a lengthy period, and al though most of the mechanism is brass and painted iron (thus being relatively immune to moisture), a few vital parts, such as the steel worm for the right ascension drive, were showing serious signs of corrosion. The assembly weighs in the neigh borhood of a quarter-ton -- about the same as an upright piano -- and is NOT your ordinary garden variety portable telescope. It could not be stored in my garage and moved out for observation without some sort of moving equipment. However, a solu tion was soon found. A strong dolly was constructed, with 4 heavy-duty ball bearing casters, and the base of the pier is now firmly bolted to the wooden platform. It is now possible for me to wheel the telescope in and out of my garage unassisted, al though it is still considerable effort, inasmuch as there is a slight grade to my black top driveway. When placed on a level spot on the driveway, however, the telescope is quite stable, even on wheels, due to its great mass. Problem satisfactorily solved.
The objective of this telescope has a clear aperture of 6.19". It was filthy. Although the exterior surface was protected by a heavy brass cap, some corrosion had taken place inside the cell, and flakes of corroded brass had gotten between the crown and flint elements. There was also a fair amount of gummy brown residue on the interior surfaces. The objective was therefore carefully disassembled, with due regard to the orientation of the elements relative to each other, and given a thorough but gentle cleaning. There remain some scratches, however, as would be expected from the estimated 100-plus years of age. The scratches are not serious and do not appreciably degrade the contrast and resolution of the image. More on this below.
The brasswork has been cleaned as far as possible, and the pier and tube have been repainted. The tube has 2 coats of white enamel, and the pier has been repainted black. The equatorial head is difficult to paint, due to its intricate construction, and this has been left with its original battleship gray paint for the time being. Mechanically, the mount is in good condition. All bearings work smoothly, and even the declination slow motion is OK. Corrosion of the steel worm should not be a problem, provided no further corrosion occurs.
The telescope had no finder. A 7x30 model has been ordered from Jaegars, and should arrive soon.
The original eyepiece holder is 2 inches ID. An ancient Ramsden eyepiece was fit ted to this. This eyepiece has a focal length of about 1 inch, and consequently gives about 90x with the 90 or 91-inch focal length of the objective. However, it has very short eye relief and is uncomfortable to use, especially with objects high in the sky. I have adapted the eyepiece holder of my own 4-inch refractor to the eyepiece holder of the large scope, and it is now usable with a diagonal and any standard 1-1/4 inch eyepiece.
Optically the scope is performing excellently. Due to poor seeing, I have not yet attempted very difficult objects, but even with relatively poor seeing, the close pair of Epsilon Lyrae is very cleanly split, with the smallest diffraction discs I have yet seen on this pair. M l3 is bright and beautifully resolved. The Perseus double clusters are magni ficent. Jupiter shows great detail, even with bad seeing (at moments), and a shadow transit was spectacular. The big aperture and long focal length make for much better image contrast than usually seen with smaller apertures. At 300x, I could practically count individual boulders in Copernicus, or so it seemed.
Most good nights will find me out with this telescope. Club members are invited to use it whenever the spirit moves. Call me early any good evening at 799-0723; with few exceptions, I will be home and the instrument will be available. Use it: it's your telescope.
After introductory remarks by Robert Sanders, founder of the Association, it was moved that the name of the organization be Amateur Astronomers Association of Princeton. The motion was passed. Mr. Sanders suggested that three committees be formed, and appointed members as follows. Meetings and Programs: Gifford Havens, chairman; Stan Wells, Nancy Harris. By-Laws: Fred Bowers, chairman;Milo Wadlin, Ron Rogers. Nominating: it was suggested that this committee wait for a couple months to allow members to become acquainted. After some discussion of meeting dates and times, it was decided to hold meetings on the second Monday of each month. The next meeting will be on December 10, 1962 at 8 PM.
There was some discussion of telescopes owned by members. Six members have their own telescopes, and four have observatories. Mr. Sanders suggested that the next meeting be devoted to telescopes. A motion to make Sanders temporary chairman was passed. He offered to have the next meeting at the Lawrenceville School. A motion to adjourn was passed.
(Signed) Gifford Havens.