Drawings of cameras and film spools

Comprises drawings of various pieces of machinery with calculations. Le Prince made these on the back of a compliment slip headed 'Le Prince and Pepper'. This was a company created to develop and sell Lincrusta wallpapers in New York. There is also a small fragment of lined paper which was co-located with the compliment slip. The following words and numbers are written on it 'Augustin Sketch 123 ___ 321'.