Author Topic: lens  (Read 2539 times)

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Offline 59wash

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lens
« on: October 21, 2012, 08:48:38 AM »
what is it ? it is 15 1/2"dia 2 1/2 thick could start a fire on cloudy day 814 603 1781

Offline gibsontool

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Re: lens
« Reply #1 on: October 21, 2012, 09:17:14 AM »
Maybe a lens that was mounted over top of a large diameter ships compass ?

rod

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Re: lens
« Reply #2 on: October 21, 2012, 09:42:42 AM »
looks like it swiveled

Offline rusty

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Re: lens
« Reply #3 on: October 21, 2012, 11:00:39 AM »

It is rather thick, so it's focus length is going to be very short, perhaps a searchlight lens?

(Magnifying a compass that is already 15 inches wide doesn't seem usefull..)
Just a weathered light rust/WD40 mix patina.

rod

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Re: lens
« Reply #4 on: October 21, 2012, 02:01:41 PM »
maybe lighthouse

Offline Fins/413

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Re: lens
« Reply #5 on: October 22, 2012, 04:20:27 AM »
Lighthouse lens are usually Fresnel type
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Offline gibsontool

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Re: lens
« Reply #6 on: October 22, 2012, 08:51:47 PM »
gotta agree with you Rusty, your idea sound logical

Offline scottg

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Re: lens
« Reply #7 on: October 23, 2012, 10:25:15 AM »
surely it must be some kind of stage lighting?
    yours Scott

Offline Brophy

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Re: lens
« Reply #8 on: October 23, 2012, 12:25:42 PM »
surely it must be some kind of stage lighting?
    yours Scott

Good thought but I've never seen brass on any stage equipment.

Brass/bronze sez marine or medical/scientific to me.

...Rob
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Offline OilyRascal

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Re: lens
« Reply #9 on: October 23, 2012, 12:33:32 PM »
Brass also suggest explosion proof/non-sparking environment to me.
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Offline Brophy

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Re: lens
« Reply #10 on: October 23, 2012, 12:40:40 PM »
This looks similar....





http://curiousscience.com/1/Scientific/Large-magnifier-on-stand-P347.html

I've made a few of these over the years for stage props.

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Offline Mel Larsen

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Re: lens
« Reply #11 on: October 23, 2012, 01:46:47 PM »
I probably wouldn't take much of a light behind that lens to make a real bright spot light??????????
Mel
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