I was especially fascinated in class with the pocket watch cameras. I did a little research, and I discovered the camera shown in the powerpoint is a Lancaster Pocket Watch camera (a ladies' model), produced in 1886. This particular model was patented in 1886 and made until 1890. It was difficult to use, and sold poorly. There are only four original known in existence.
An improved version was made in 1890, which was sold until until the early 1940s. It had an attachable viewfinder and used 5/8 x 7/8 inch film with 20 exposures per roll which could be enlarged to 3 1/2 x 5 1/2 inch prints.
And of course, there are these watches' modern equivalents: high-definition, digital cameras in sleek pocket watches with included USB cord.
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