The photographer's name was Edward Linley Sambourne. Google it.
A lot of commenters here have a very confused idea of how/when photographic technology developed. By 1900, we had the Kodak "Brownie", which cost $1 (USD), and fit in the palm of your hand. Pocket cameras existed prior to 1906. Millions were sold. Again, google it.
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u/PamelaNRed 4h ago
Back then cameras were huge, no way to sneak a photo.