Tool Talk

Picture Forum => Picture Forum => Topic started by: 59wash on October 21, 2012, 10:48:38 AM

Title: lens
Post by: 59wash on October 21, 2012, 10:48:38 AM: what is it ? it is 15 1/2"dia 2 1/2 thick could start a fire on cloudy day 814 603 1781
Title: Re: lens
Post by: gibsontool on October 21, 2012, 11:17:14 AM: Maybe a lens that was mounted over top of a large diameter ships compass ?
Title: Re: lens
Post by: rod on October 21, 2012, 11:42:42 AM: looks like it swiveled
Title: Re: lens
Post by: rusty on October 21, 2012, 01:00:39 PM: 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..)
Title: Re: lens
Post by: rod on October 21, 2012, 04:01:41 PM: maybe lighthouse
Title: Re: lens
Post by: Fins/413 on October 22, 2012, 06:20:27 AM: Lighthouse lens are usually Fresnel type
Title: Re: lens
Post by: gibsontool on October 22, 2012, 10:51:47 PM: gotta agree with you Rusty, your idea sound logical
Title: Re: lens
Post by: scottg on October 23, 2012, 12:25:15 PM: surely it must be some kind of stage lighting?
yours Scott
Title: Re: lens
Post by: Brophy on October 23, 2012, 02:25:42 PM: Quote from: scottg on October 23, 2012, 12:25:15 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
Title: Re: lens
Post by: OilyRascal on October 23, 2012, 02:33:32 PM: Brass also suggest explosion proof/non-sparking environment to me.
Title: Re: lens
Post by: Brophy on October 23, 2012, 02:40:40 PM: This looks similar....

(http://curiousscience.com/slir/w620-h500/images/stock/img347.jpg)

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

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

...Rob
Title: Re: lens
Post by: Mel Larsen on October 23, 2012, 03:46:47 PM: I probably wouldn't take much of a light behind that lens to make a real bright spot light??????????
Mel