Watson Acme

[dive69uk]

Hi

I have a Watson Acme that I have been using for 5x7 paper negatives, made between 1890 to 1940, ish. The actual recess in the holder is 5x7-1/2'.
I would love to find out more information relating to the holders size and the process it was designed for. All I can find on the web is that it was possibly a glass 1/2 plate?

Can anybody help with this?

Regards

[Tin Can]

http://redbellows.co.uk/CameraCollection/Watsons/WatsonAcme_gen.htm

[Ron (Netherlands)]

Sometime ago I started a little database on double bookform plateholders:

Acme camera with matching half plate holders

https://www.photrio.com/forum/threads/wooden-book-form-plate-holders.171222/page-2#post-2231872

plate holder for half plate Acme camera with dimensions:

https://www.photrio.com/forum/threads/wooden-book-form-plate-holders.171222/#post-2228429