Article on CC Harrison's 1857 Orthoscope Lens

[CCHarrison]

please see

http://www.antiquecameras.net/1857ccharrisonlens.html


thanks
Dan

[seawolf66]

Thanks dan:

[Paul Fitzgerald]

Dan,

Thanks for the link, I did notice the curved slots in the aperture ring, the basis of equally spaced aperture markings still used today. Just abit ahead of his time.