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1960's Telescope Restoration Part 2 - by Herb Lapp

In this part of the article Herb continues with the restoration of the telescopes and tells us more about his experience working and Edmunds Scientifics.

Part 1 of this article is here

 

 

 

I Began work on bringing back the original Edmund pedestal equatorial mount. I think the equatorial section was part of a prototype of some sorts as the gray color of the declination section was different than that for the right ascension axis. But that's a guess.

I purchased this about 1976 well after they manufactured and sold the six inch scope. But they may have had this laying around in the back shop and decided to get rid of it but putting it out in the store. It never made it that far. When I saw the store manager lug it out I stopped him and we bartered right then and there. I was hoping for a good price but would have paid almost anything short of the real cost. It's been too long to accurately recall what I paid for it but something inside says about $25!!! What a steal and getting a piece of Edmund history.

The six inch equatorial mount

 

Sometime ago I modified the cradle adding a wooden board so I could attach the scope without using the bolts directly attached to the tube preventing me from rotating the tube. But something significant happened in my life about 1980 when I left teaching in Southern New Jersey and took a position out near Chicago working for Commonwealth Edison in their nuclear program.

Eventually moving there meant the mount went with but it sat dormant till the present
time. I built an 8” reflector about 1976-8 and had the very heavy equatorial for it. That was a monster. The school I taught at had purchased the new Edmund 8” scope with all the bells and whistles. A couple of guys, the previous astronomy teacher, and an industrial arts guy built an observatory adding a permanent pipe mount cemented into the concrete foundation. They kept the scope of the equatorial since it was rather bulky.

Unfortunately the observatory sat in an open field which was broken into and the scope was stolen. With that experience the team decided to purchase a Celestron 8” Cassegrain scope which was brand new at the time making the original equatorial surplus hence it became my treasure. I managed to bring that mount to my
home but due to its bulk had to leave it outside unprotected where it rusted badly.

Anyway I had hoped to mount the 8” on the 6” pedestal even knowing it might have been under rated for the task. Its portability was the driving issue for me. This all happened when the Dobesonian mounts was gaining some popularity but I hadn’t gotten the world about that design at that time.


So a later project will be to make a Dobson mount for the 8” scope and leave the 6” pedestal mount dedicated to the 6” scope! Sorry for the detour, but back to the current restoration work. I decided to work on the pedestal section sans the equatorial which is why you see the large crescent wrench locked onto the attachment nut.

 

The Edmund’s


I’m writing this up as the work gets done so it might jump around some. While working alone in the shop and basement I have time to think and the Edmund’s came to mind again. It was a long time ago and it takes some to bring it back. I remember both Mr. & Mrs. being in the store. It was after all a family business. I don’t know if he served during the war but he somehow found himself with an opportunity with the government downsizing all the military hardware it acquired, stockpiled and in some cases had shipped back from wherever. He was likely struggling like most guys were in the 50s so he started his surplus optics business working out of his home that was way before the original store manufacturing plant was built in Barrington.

I can almost remember the name of the road but not quite …but I can clearly see it and them in my mind’s eye. I think the property the house sat on was adjacent to the store which made sense.
They were both thin and rather formal from my memory but not stuck up. He was much
friendlier than she but that was the early 50s and proper women were never familiar as she was a classy lady.

Obviously I saw him out and about on my visits to the store which to me was better than visits to the ice cream parlor or candy store. He’d help if asked but was open to letting a 14 year-old kid roam around and around dreaming. When I was teaching at Deptford High where I graduated from in ’65 I was about 24 years old. Money was tight so an opportunity to make a few extra bucks was appreciated but to work at Edmund’s well, I’d almost work there for free it meant so much to me (But don’t tell anyone at Edmund’s I said that!).

By that time you didn’t see much of Mr. Edmund’s and I can’t recall seeing his wife again. The scope business was probably pretty soft but the disco era was upon us and it came in with a bang. Somehow they latched onto that phenomenon with the advent of light shows. Edmunds had all kinds of thin front surface mirrors; they found thin rubber membrane material and stretched that over large bass speakers. The mirrors were affixed to the stretched membrane which vibrated like heck when loud disco music was played. They created a light studio to showcase the things they made. I fell in love with the Moody Blues-Knights in White Satin that still plays in my head.

Lasers were then available having their research lab quirkiness overcome. At that time
Edmund’s sold lasers with their label on them. I don’t think they made them, likely an
outsourcing arrangement but I really don’t know. The place was jumping. Crazy folks would come down the NJ Turnpike, get off Exit 3 near Barrington and bring tons of money to buy all the light show toys. I sold a ton of that stuff…probably 10 times more than the telescopes that still sat out on the showroom floor. I enjoyed selling scopes and techie things but the light show folks paid the bills and my paycheck! Edmund’s hired several high school teachers as part-time weekend sales people. We were good with folks. Knew enough science to fit and worked cheap!

What a combo, a win-win for both the company and the few hungry teachers.
I was there about three years when for some reason I left..no wasn’t fired but life was changing perhaps workload. I moved from Deptford Twp HS to Washington Twp, now the largest school district in South Jersey and the very best! Soon they made me chairman, now chairperson for the merged math-science departments.

The first step required the base to be cleaned. I used the garden hose and a stiff brush to knock off all the dirt, dust and grime from the parts. Then I hand sanded each after disassembling to remove as much lite rust and contamination on the surface prior to spray painting. I used a new textured spray paint with a gray base color to change up the appearance from being sprayed with the traditional battle ship gray. This is the type of paint suggested to be used to repaint outdoor furniture. I don’t know
how it will hold up but I do like the 3-D texturing affect you see here.

The counterweights

 

The pedestal

 

I used stainless steel ¼ x 20 bolts with wing nuts to reattach instead of the brass hardware I installed so long ago. The bumping of the legs with the bolts when I removed and re-installed them for transport dinged up the soft threads making it harder and harder to simply do the breakdowns and assembly tasks in the field. Gee back in the 70s Home Depot and Lowe’s didn’t exist and getting local access to
stainless steel nuts and bolts wasn’t a possibility. Remember this all predates the pc and World Wide Web we now take for granted. Gee back in the “dark ages!” How did we survive and get anything done?

At this stage I thinking of making a new cradle based on Doug Strobel design found on his Meet Smurfette web site. I want the tube to be able to rotate to improve the experience I have observing at the eyepiece. Searching for professionally cast tube rings showed it would cost approximately $250 for just the rings, so making my own became the option I pursued even though it added weight to the mount over that from using aluminum. I already tried using stainless steel hose clamps but didn’t like having to fiddle with a screw driver to release and attach the scope from the mount, not to mention all the scratches on the tube.

The wooden cradle

Well the idea was to make this cradle shown here but I had several big slabs of beautiful black walnut that begged being part of the new 6” scope. It could easily have held a …well you name the diameter. I made a template based on my best guesses at Doug’s cradle. I decided I was going to do some 18th century cabinetmaking and cut hidden dovetails into each cradle.

 

One half of a cradle piece

 

The cradle pieces

 

When I finished making the rough cut lower cradle, I realized oh I have two more to make. After what I experienced on top of everything else I’m doing I sat back and thought a minute which lead to the decision to use them for the lower half. The first image shows my bandsaw cuts while the second shows the sanded parts. I was in for a surprise when I tried to lay the 7” tube in the cradle on my table saw!

 

The tube and cradle don't fit

 

Resizing the cradle

 

The first principle of woodworking is measure twice cut once….well I’ve been driving to get further along and am getting a little punch drunk. Luckily as you can see the tube in the first image sits high and there’s plenty of wood. I didn’t bother to figure out what I did, I just went in and using the outer dimensions of the white template seen in the upper left edge of the second image. I decided to use the tube’s outer perimeter rather than measure and use a compass. I found a thin piece of Masonite and used it. I trace the tube’s edge and tried it against the tube….a perfect fit. But I knew I wanted some felt to line the bed to lower friction when rotating the tube in the field, so I hand traced a larger diameter freehand. So there’s a gap to allow me to glue felt into the bed at a later time.

 

The pretty part which took several hours was to cut in blind dovetails on both ends. I made the straight piece using another thinner piece of walnut and by eye decided what I needed to do. I offset the dovetail ½” off the very end of the yokes so the tenon would be invisible when the mount work was completed. I cut the wedge ends into the flat board and used it as a template to trace around the bottom of the yokes. The hard part was cutting out all this walnut using chisels and a mallet. I used a back saw to make the trapezoid, (I can’t remember its formal name). You can see the trial fit with the yokes just standing on the table saw.

Now the cradle fits

 

The dovetail

Like 18th century joiners, I used a backsaw to cut the diagonal edges. They over cut the right and left triangle edge but cut just a smidge off the pencil line. It’s under cut and then hand fitted so the final fine chisel cuts are carefully made walking the piece into its locking frame. These joints were used to assemble drawer sides and were not seen by the critical viewer. So over cutting made the work go faster where time was money back then too.

The dovetail fit

 

Both dovetails in the cradle

 

No they don’t fit perfectly but they don’t have to. I don’t make these very often, in fact almost never.
The first cut out took forever but the second one was cut out much faster. I wasn’t as afraid and had learned the best ways to use the chisel including sharpening it several times.
The joints were then glued and clamped on one end, the first one…yes the first one is the hardest and your worst; the second fit like a glove and was done much faster as I said. That’s how it goes in the real world. Perfect was not my goal I’m not figuring the mirror. This side will never be seen as it’s the underside. I will add a couple of brass wood screws on both ends to add some additional security.
In real life I wear a belt with my suspenders! The image below shows the upper or proper side before gluing.

 

The completed cradle

 

The tube fits the cradle

The rest of the afternoon was spent working on the 4” mount. It’s repetitious in it needed cleaning, sanding and painting. I took the mount apart, a task not yet done on the 6” mount and cleaned up the fittings and the two axes. These and the mount itself were painted using the same sand color outdoor lawn furniture spray I used on the 6”.

 

The pedestal mount is refurbished

 

Edmund used the same pedestal for both the 6” and 4-1/4” scopes. You can see there wasn’t much beef put into the right ascension and declination axes. But the mirror is much lighter as is the tube so it worked very well for me years ago. Now being more discriminating I may have a different opinion after it’s assembled and field tested. But it’s going to my neighbor for him and his kids as a starter scope. It will be hundreds of times better than the children’s first refractors made by Meade, etc.

Next

Let's continue with the telescope restoration

 

Celestron 21037 PowerSeeker 70EQ Telescope

Celestron 21037 PowerSeeker 70EQ Telescope

70mm (2.8") diameter refractor, 700mm focal length (f/10), German equatorial mount with RA and DEC slow-motion controls and setting circles, 5x24 finderscope, 20mm eyepiece (35x) - 1-1/4", 4mm eyepiece (175x) - 1-1/4", erect image diagonal - 1-1/4", Barlow lens 3x - 1-1/4", adjustable aluminum tripod with accessory tray, "The Sky Level 1" CD-ROM. Metallic charcoal black tube color.