I have been working for several years digitising the 19th.century Dallmeyer archive held by Brent Library.
I found a number of lantern slides showing lens making in the late 19th.century.

What I am looking for is an explanation of exactly is going on in each slide.

www.samackenna.co.uk/wetplate/lanternslides/lantern_slides.html

I would value any suggestions that might be made.

Seán MacKenna