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Zenith sector micrometer

The editor's next project?

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ega25/11/2018 16:41:49
1152 forum posts
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What happened to the image whose URL I pasted in?

https://www.ebay.co.uk/itm/Antique-Old-Print-Astronomical-Instruments-Zenith-Sector-Dolland-Micrometer/352498360568?hash=item52128a20f8:g:cRUAAOSwIDJb02Zq

Edited By ega on 25/11/2018 16:43:05

Michael Gilligan25/11/2018 17:25:02
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**LINK**

https://www.ebay.co.uk/itm/Antique-Old-Print-Astronomical-Instruments-Zenith-Sector-Dolland-Micrometer/352498360568

Shorter URL will probably do ...

ega25/11/2018 22:39:31
1152 forum posts
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Michael Gilligan:

Thank you. A case of buffer overflow, perhaps?

Neil Wyatt26/11/2018 11:37:58
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Probably a case of embedding the wrong link

Funnily enough I'm currently making a pair of 3D printed 'sun compasses'. One is for a retired couple, both ex-schoolteachers, from my astronomy club who used to use simple versions for an educational activity - tracking the sun in altr and az for a schoolday. They wanted something more robust, but I didn't want to commit to a huge brass project (although it could have looked great).

sun compass.jpg

planes.jpg

JasonB26/11/2018 11:47:11
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Just hope the sun is not to strong to distort the plastic or make it brittle in a few yearswink

Edited By JasonB on 26/11/2018 11:47:30

ega26/11/2018 12:00:15
1152 forum posts
95 photos

Neil Wyatt:

Thank you for exposing this old print to the light of day! Sun compasses and sun dials would seem to be an excellent school project.

It looks as though I should have clicked the Link icon rather than the Image one; I know I am not the only member who struggles with this software and would gladly exchange the Smiley icon for a Help button. It's awkward to have to go to the website FAQs in mid-edit.

I think somebody suggested a dummy (!) thread where we could experiment rather than inflict our mistakes on other members.

JasonB26/11/2018 12:10:17
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Posted by ega on 26/11/2018 12:00:15:

I think somebody suggested a dummy (!) thread where we could experiment rather than inflict our mistakes on other members.

You'll be wanting this thread then.

Neil Wyatt26/11/2018 13:00:01
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Posted by JasonB on 26/11/2018 11:47:11:

Just hope the sun is not to strong to distort the plastic or make it brittle in a few yearswink

Funnily enough you can get a UV stabilised filament called ASA.

And it's legal, decent, honest and truthful!

Neil

ega26/11/2018 18:08:11
1152 forum posts
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Posted by JasonB on 26/11/2018 12:10:17:
Posted by ega on 26/11/2018 12:00:15:

I think somebody suggested a dummy (!) thread where we could experiment rather than inflict our mistakes on other members.

You'll be wanting this thread then.

That was indeed the one I had in mind.

I have sent you a PM.

ega27/11/2018 14:36:09
1152 forum posts
95 photos

Neil Wyatt:

There is an interesting reference to the Vikings' use of the sun compass and other navigational aids in this BBC item:

https://www.bbc.co.uk/news/uk-scotland-46194699

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