Date   

Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Joe Zeglinski
 

   Since I couldn’t find an original “wall-mount”  slipstick,  I just remembered  an old Plan-B, of making my own. We now have the latest PC technology to do it very easily as a home DIY. The 6-foot, or preferably easier to handle  a 4-footer,  can be “duplicated”. I once made an “Octal” Circular slide rule, simply using my engineering drafting tools, after I graduated and started in the computer field. Computer technology now makes it far easier to do.
 
    Just scan an existing slide rule, at high resolution, section by section, and print the (coloured) sheets on say a laser printer, or have it done at a  print shop on a blueprint-sized printer. Then just glue the printed sheets unto a backing of plywood, or much lighter balsa wood, even thin sheets  (with  re-enforcement spacer ribs) of Plexiglas. Then you can have any brand or model of your old favourite slide rule, complete with accurate markings.
The difficulty is flipping it over to the log & trig functions, but even that could be done by flipping it over downwards  on  hinges.
 
    Another project, besides astronomy, that would be out of this world.
 
    Just a thought ... but thanking the group for their patience,  I should probably end this AP-GTO  off-topic, though very interesting thread. 
Joe
 
   
 

From: Don Anderson via groups.io
Sent: Friday, March 12, 2021 11:51 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)
 
Barry's is bigger than oursEmoji
 
Don Anderson
 
 
On Friday, March 12, 2021, 07:30:02 p.m. MST, Joe Zeglinski <j.zeglinski@...> wrote:
 
 
Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Jeff B
 

What a great garage sale find.  Would be a natural for American Pickers!

I remember the huge one in college physics class.  We had an "advanced course" in it and also circular slide rules that you could stuff inside your pocket protectors with the pens.  Computer card stacks...learned real quick to always number the cards....in case you dropped the deck.....which you would eventually do.....that also carried over to numbering your viewgraph slides too.

The big intense debate in my engineering college was centered around the use of the emerging hand calculators during testing.  Their relative cost was similar to a high end cell phone today but some students had them.  Took my school, Cincinnati, a good year to allow it as they saw the handwriting on the wall......where the big slide rule used to be.

Jeff

On Fri, Mar 12, 2021 at 11:51 PM Don Anderson via groups.io <jockey_ca=yahoo.ca@groups.io> wrote:
Barry's is bigger than oursEmoji

Don Anderson


On Friday, March 12, 2021, 07:30:02 p.m. MST, Joe Zeglinski <j.zeglinski@...> wrote:


Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Fun with the Mach 2...

Bill Long
 

GTX + 16803 + Mach 2 should be illegal. 🙂 Excellent star HFD on focus, all the frames tonight are excellent in terms of star roundness. Not guiding at all. 



Re: APCC shows Altitude at 0 in Park 3

Bill Long
 

Right. If Wayne issued a malformed RCAL at some point, homing the mount will clear that. As a rule of thumb with both of my encoder mounts, I use the APPM "RECAL At Zenith" option during the model build. After that finishes I do home the mount (probably not needed) and I get on my target and use APCC to do a APPM Solve and Sync. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Ray Gralak <iogroups@...>
Sent: Friday, March 12, 2021 11:31 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3
 
If the mount's site latitude and longitude are correct, just home the mount, as Bill suggested.

If the mount's latitude is wrong, power cycle the mount and make sure APCC is initializing the mount with the proper site lat/long.

-Ray

> -----Original Message-----
> From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Wayne Hixson via groups.io
> Sent: Friday, March 12, 2021 10:02 PM
> To: main@ap-gto.groups.io
> Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3
>
> Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...
>
> nope. This did happen some time ago and you had a solution if I recall but can’t remember!
>







Re: APCC shows Altitude at 0 in Park 3

Ray Gralak
 

If the mount's site latitude and longitude are correct, just home the mount, as Bill suggested.

If the mount's latitude is wrong, power cycle the mount and make sure APCC is initializing the mount with the proper site lat/long.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Wayne Hixson via groups.io
Sent: Friday, March 12, 2021 10:02 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3

Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...

nope. This did happen some time ago and you had a solution if I recall but can’t remember!


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

David Fischer
 

My high school days were spent on an IBM 1440 (first 2 years) and a UNIVAC 1106 my senior year.  Mostly FORTRAN then COBOL, ALGOL and assembly on the UNIVAC.
-- David F.


On Fri, Mar 12, 2021 at 5:57 PM Barry Megdal <bmegdal@...> wrote:

I used to program the IBM 1620 at the neighboring junior college when I was in high school – unique thing about that machine was that internal storage was in decimal (BCD) rather than standard binary……

 

-        Barry

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


Re: APCC shows Altitude at 0 in Park 3

Bill Long
 

Did you HOME the Mach 2?


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Wayne Hixson via groups.io <wayneh9026@...>
Sent: Friday, March 12, 2021 10:01 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] APCC shows Altitude at 0 in Park 3
 
Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...

nope. This did happen some time ago and you had a solution if I recall but can’t remember!


Re: APCC shows Altitude at 0 in Park 3

Wayne Hixson
 

Hi Ray, I have tried that no luck. Trying reboot and restart the CP5 right now...

nope. This did happen some time ago and you had a solution if I recall but can’t remember!


Re: APCC shows Altitude at 0 in Park 3

Ray Gralak
 

Hi Wayne,

That might happen if there happened to be a communications issue getting the latitude. Try restarting APCC.

-Ray

-----Original Message-----
From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Wayne Hixson via groups.io
Sent: Friday, March 12, 2021 9:07 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] APCC shows Altitude at 0 in Park 3

Altitude at park 3 should be 47 degrees. Site is correct. This happened before, not sure what the problem is.


Wayne


Re: APCC shows Altitude at 0 in Park 3

Wayne Hixson
 

PS running a Mach2. Latest Driver, APCC and ASCOM


APCC shows Altitude at 0 in Park 3

Wayne Hixson
 

Altitude at park 3 should be 47 degrees. Site is correct. This happened before, not sure what the problem is. 


Wayne


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Don Anderson
 

Barry's is bigger than oursEmoji

Don Anderson


On Friday, March 12, 2021, 07:30:02 p.m. MST, Joe Zeglinski <j.zeglinski@...> wrote:


Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Don Anderson
 

Wow! Awesome Barry. How heavy is it?  Mine is a Hughes-Owens Bamboo with glass window in the slide. It is in as good a shape as when I bought it in 1969.

Don Anderson


On Friday, March 12, 2021, 07:20:52 p.m. MST, Barry Megdal <bmegdal@...> wrote:


Yes – that is a 6-foot slide rule on the wall.  Couldn’t resist buying it years ago at a garage sale.  These used to hang on the blackboard in my high school chemistry class so they could teach us how to use them.

 

And my new Mach2 in the foreground just to make the photo appropriate for this forum J

 

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Joe Zeglinski
 

Congrats Barry,
 
...  on finding that huge Pickett. Years ago, I was looking for one as well, and finally gave up. Settled for finding the Electrical Engineering Pickett model instead.
Now, seeing yours,   I may resume that search.
 
Joe


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Barry Megdal
 

Yes – that is a 6-foot slide rule on the wall.  Couldn’t resist buying it years ago at a garage sale.  These used to hang on the blackboard in my high school chemistry class so they could teach us how to use them.

 

And my new Mach2 in the foreground just to make the photo appropriate for this forum J

 

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Barry Megdal
 

I used to program the IBM 1620 at the neighboring junior college when I was in high school – unique thing about that machine was that internal storage was in decimal (BCD) rather than standard binary……

 

-        Barry

 

Dr. Barry Megdal

 

President

Shb Instruments, Inc.

19215 Parthenia St.  Suite A

Northridge, CA 91324

www.shbinstruments.com

(818) 773-2000  (818)773-2005 fax

bmegdal@...

 

Faculty (retired)

Dept. of Electrical Engineering

Caltech

 


Re: How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Roland Christen
 


one lithium (yellow) and one synthetic (green with MoS2).
MoS2 is very bad for brass or bronze worm gears. The S2 (sulfur) corrodes these metals. Lithium is usually too thin. Try a super lube type grease without sulfur.

Rolando


-----Original Message-----
From: Dominique <d.h.durand@...>
To: main@ap-gto.groups.io
Sent: Fri, Mar 12, 2021 5:18 pm
Subject: Re: [ap-gto] How to Re-grease a Mach1 with Auto-Adjust Motor Boxes?

Hi,
With my Mach2 in my observatory and travel restrictions, my 2011 Mach1 has been sleep for a few months, so, reading your discussions, it made me want and courage to revisit it. I already had a little control on the lubrication side 4 or 5 years ago but not completely and I believe only on the RA axis. I carefully watched the linked videos / photos to check the cleaning and regreasing phases to be done ... and I attacked the disassembly, separation of the 2 axes and treatment of the RA axis to begin with. I am not in the "extreme cold" zone and I have 2 types of grease at my disposal, one lithium (yellow) and one synthetic (green with MoS2). This evening I cleaned and I let the night pass before doing the lubrication, it remains to know which of the 2 greases it is better to use. On the brake part of the RA axis, which was a bit hard and which I have already cleaned and reassembled, I put a little synthetic grease and that seems to have improved things. So I will see tomorrow morning and based on your advice if necessary. As I had opened and / or dismantled the engine blocks several times, it didn't seem complicated to me ... you have to be careful with the cables.
Clear Skies
Dominique

--
Roland Christen
Astro-Physics


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

M Hambrick
 

I was in chemical engineering at University of Houston for a couple years, then finished at Texas A&M. At UH we did our Fortran programs on the IBM 360, and punch cards were the only option. When we had finished punching our cards we would hand them over at the I/O desk where they would read them and compile our programs. Three hours later we could pick up the printout to see what the errors were. It was a very tedious process.

At Texas A&M they had built their own main frame. Wilbur they called it, and at that time (early 1980s) the engineering students had the option of using punch cards or desktop terminals. The desktop terminals at A&M were way faster for compiling our programs than the punch cards, but there were lots of problems with Wilbur, and he would crash without warning every couple months. There were many students who lost their 10 X 10 matrix inversion programs (or whatever) when Wilbur crashed and they had to type it in again from scratch. I never gave up using punch cards. 

Mike

 


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Jeffrey Wolff
 

We used a Control Data Corp. CDC-6500 with two core processors with 256K of ferrite core memory. The core processors used 60 bit floating point which was pretty good for the 70s. There were 18 peripheral processors that ran the operation system and all the IO. I programmed the OS in Compass which was the assembly language at the time. The peripheral processors used 18 bit words vs 60 bit for the core.

The first couple of years of programming I had batch priority for my programs. It took about 24 hours after reading the punch cards into the queue before we could put up the output jobs printout. Eventually I had interactive access using TTYs or typewriter type terminals with built in printers.

When I went back for my masters almost all my work was down on UNIX systems.


Re: Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)

Joe Zeglinski
 

Hi Kent,
 
    I was at UofT ( Electrical Engineering - University of Toronto) 1965-1970 about the same time as you  were in Texas.
They showed me boxes of vacuum tubes in surplus storage,  that the electrical engineering faculty purchased as part of their project to build their own computer, then scrapped everything, when IBM came out with their 7094. Don’t know how far our tube version went.
 
Joe Z.
 

From: Kent Kirkley via groups.io
Sent: Friday, March 12, 2021 5:49 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Slide Rules and Slipsticks - in the 1960's B.C. - i.e. (Before Computers)
 
Joe

You said "The U of T had the fortune of getting"
Was U of T, Texas or Tenessee?
If Texas what years were you there?
I was there 1965-69 and also used Fortran punched card programs.
And yes, I used a slide rule (2) in high school, both K&E's.

Kent Kirkley
 
 

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