Ross 15inch. lens

[menelajas]

Hello,

I'm looking information about:

Ross. London No47986 15 inch. Loncentric patent. wheel stop (16; 19;22; 27;32) Diametre aprox 7cm, long 6cm. Lens. I'll add the pictures a bit later.

[CCHarrison]

Patent applied for in 1888, came to market in 1892. Invented by Dr Hugo Schroder.

See this google book reference written by the inventor of the Concentric Lens http://books.google.com/books?id=g30...rr=1#PPA134,M1

Dan

[menelajas]

Thanks a lot