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Equipment Discussions >> Classic Telescopes

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terraclarke
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Reged: 05/29/12

Loc: Just South of the Mason-Dixon ...
Digging deep in the Edmund artifact box. new
      #5741089 - 03/18/13 04:35 PM Attachment (37 downloads)

Who else has seen or has one of these? It's a sort of "celestial slide rule" used to determine sidereal time. Mine dates from 1965 or 66? You can see that I was living in Southern California at the time, from the longitude penned in the box in the lower right of the "calculator", not a bad place to grow up in astronomy at the time I might add .

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terraclarke
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Reged: 05/29/12

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Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5741092 - 03/18/13 04:37 PM Attachment (23 downloads)

Here's the flip side. It contains a table of RA and Dec for 39 of the best and brightest Messier objects and a few salient definitions.

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terraclarke
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Reged: 05/29/12

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Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5741101 - 03/18/13 04:40 PM Attachment (24 downloads)

And if you had the "Edmund Star Time Calculator" you had to have this as well

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rdandrea
Carpal Tunnel
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Reged: 06/13/10

Loc: Colorado, USA DM59ra
Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5741258 - 03/18/13 05:45 PM

See pages 36 and 37 of this catalog, which I believe is from 1962 (before your time, I know).

http://geogdata.csun.edu/~voltaire/classics/edmund/edmundnodate.pdf


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apfever
Carpal Tunnel
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Reged: 05/13/08

Loc: Colorado
Re: Digging deep in the Edmund artifact box. new [Re: rdandrea]
      #5741581 - 03/18/13 07:56 PM

I have the book but not the slide rule. Nice accessory.

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cloudmagnet
sage


Reged: 12/04/08

Loc: Georgetown, Texas
Re: Digging deep in the Edmund artifact box. new [Re: apfever]
      #5741603 - 03/18/13 08:08 PM

WOW!!! Does that catalog bring back memories! On page 28, is item #30,202 - a 42 mm objective. I was 12 or 13 at the time, and managed to scrape together the $5 (plus postage) to purchase one. That, along with some water pipe, wood scraps, and an eyepiece from a found pair of binoculars, and I had my first telescope. I'll never forget my first look at- what else- the moon. I was hooked.

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rdandrea
Carpal Tunnel
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Reged: 06/13/10

Loc: Colorado, USA DM59ra
Re: Digging deep in the Edmund artifact box. new [Re: cloudmagnet]
      #5741693 - 03/18/13 08:41 PM

I think those catalogs came out quarterly. I used to wear them thin.

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amicus sidera
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Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5741694 - 03/18/13 08:41 PM Attachment (21 downloads)

Very nice, Terra! I've never seen one of those before, but it has Sam Brown's handiwork all over it. Is it used to determine a star's meridian passage at a given longitude?

Here's a little something from my own Edmund vault: the Planetimer Solar System Analog - "A graphic working model of the solar system". 10 discs held by a brass rivet in the center, one for each of the planets and the Sun (sorry, Pluto will always be a planet to me!). The back contains tables of the heliocentric longitude of the planets for the years 1971 to 2001 inclusive; if one took the time to calculate the h.l. of the planets into the future, this item would still function. Since it's snowing here tonight, I just may do so later on...


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TOM KIEHL
Pooh-Bah
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Reged: 11/17/12

Loc: N.E. Ohio
Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5741909 - 03/18/13 10:05 PM

Got the slide rule, But not the book .

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Bonco
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Reged: 04/17/06

Loc: Florida
Re: Digging deep in the Edmund artifact box. new [Re: rdandrea]
      #5741917 - 03/18/13 10:09 PM

Quote:

See pages 36 and 37 of this catalog, which I believe is from 1962 (before your time, I know).

http://geogdata.csun.edu/~voltaire/classics/edmund/edmundnodate.pdf


Thanks, That's the catalog of my memories. Bill

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Masvingo
scholastic sledgehammer
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Reged: 01/10/12

Loc: Ayrshire, Scotland
Re: Digging deep in the Edmund artifact box. new [Re: amicus sidera]
      #5742251 - 03/19/13 03:22 AM

Quote:

(sorry, Pluto will always be a planet to me!)






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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5742330 - 03/19/13 06:27 AM

Thats pretty cool Terra, first time i ever seen one.

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terraclarke
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Reged: 05/29/12

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Re: Digging deep in the Edmund artifact box. new [Re: amicus sidera]
      #5742492 - 03/19/13 09:27 AM

Yes Fred. You can input any longitude, use the calculator to determine the sidereal time for that longitude, and compare it to the RA of the particular star or other body in question. It's RA is the sidereal time at that longitude when it transits the meridian.

BTW, for those interested in sidereal transit timing, our observatory here in Cincinnati once housed large transit refractor (meridian telescope). We have our club meetings in the room where the the transit telescope was operated. There is a large slit that is now a skylight running across the longest diameter of the room which coincides with the astronomical (and geographic) meridian. Part of the observatory's original charter was for accurate time keeping west of the Alleghenies. The very accurate pendulum clock still ticks in that room. It's very cool.


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BigC
Carpal Tunnel
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Reged: 09/29/10

Loc: SE Indiana
Re: Digging deep in the Edmund artifact box. new [Re: terraclarke]
      #5742696 - 03/19/13 11:20 AM

Neat stuff!

I like those old publications and tools.Amateur radio had many "slide-rule" calculators and nomographs for calculating in the days when there were no or only a half-dozen electrical computers.

Pluto's demotion is like daylight savings time ;I can't ignore the official announcements but in my mind and heart I know Pluto is a planet and it is only truly noon when the Sun crosses the meridian!


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dgreyson
scholastic sledgehammer
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Reged: 11/06/12

Loc: South Carolina
Re: Digging deep in the Edmund artifact box. [Re: BigC]
      #5742743 - 03/19/13 11:42 AM

I'm still sulking over "Before Common Era" (BCE) instead of BC and AD. They even took one of the double bars off of the dollar sign $. So I wasnt surprised they went after Pluto.

Im just sitting complacently with my Edmund Star Finder chart I bought in 1970, still using imperial units and ignoring them all.


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BigC
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Reged: 09/29/10

Loc: SE Indiana
Re: Digging deep in the Edmund artifact box. [Re: dgreyson]
      #5742779 - 03/19/13 12:02 PM

The B.C.E. change was political and a discussion of why it was done probably violates this site's TOS.

I'm not thrilled about pictographs of turtle and rabbit replacing "FAST" and "Slow",or any of the other similar signs.26 letters are easier to learn than 4000 little pictures.


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terraclarke
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Reged: 05/29/12

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Re: Digging deep in the Edmund artifact box. [Re: BigC]
      #5743038 - 03/19/13 02:00 PM

I'm with ya on those two BigC. Pluto will always be the 9th planet! End of argument! And I too hate daylight savings time. I hate changing clocks twice a year. I have a sundial in my garden
I used to say that when I retired I'd set all the clocks in the house to Civil (Local) Mean Time for my longitude and leave them at that from then on. Then I realized I had to live in the rest of the world so there I am, changing clocks. I do hate it though!


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terraclarke
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Re: Digging deep in the Edmund artifact box. [Re: dgreyson]
      #5743042 - 03/19/13 02:03 PM

I can't agree with you on the Imperial units. I hate them. I love the metric system. Its so much easier and it's Earth based. (1 meter ~/= 10,000,000 of the meridian between the pole and the equator.)

Terra


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terraclarke
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Re: Digging deep in the Edmund artifact box. [Re: amicus sidera]
      #5743055 - 03/19/13 02:08 PM

That Planetimer is so cool. I don't remember seeing that one. I did have the planisphere but it's some how long gone. I think I gave it to my little brother long ago? The Edmund Star Time Calculator looks like Sam Brown but it says Copyright by Daniel J. Tomcek, "sold exclusively by Edmund Scientific Co., Barrington, New Jersey.

Terra


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chuck52
sage
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Reged: 12/03/09

Loc: Quartz Hill,California
Re: Digging deep in the Edmund artifact box. [Re: terraclarke]
      #5743489 - 03/19/13 05:15 PM

Hi Terra,
I have one of those slide rules, and also my Edmund planisphere from the mid 60's. Got these when I ordered my "Mounting Your Telescope" booklet.


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