Quote Originally Posted by Sirius Glass View Post
"Thornton Pickard Ruby Junior Special, Quarter plate" translates into X"xY" [please specify Imperial Inch, US Standard Inch, Imperial Nautical Inch, US Standard Nautical Inch or screw it and tell us in metric.}
Quarter plate in the UK is 1/4 plate in the US and vice versa except for US Tintypes 3"4" although sometimes erroneously called 3x4 in the US. Many film sizes are nominal reflecting older glass plate sizes with an allowance for a film adapter.

Ian