If you haven't seen these pictures yet, they are absolutely worth a look. The story behind the photographer and his technique are fascinating, as are the images. Hard to believe they were taken over 100 years ago. Stunning Images.
On a side note, one little known rule about copyrights, at least in the US, they become "
Public Domain" 70 years after the death of the creator. There are some rules on how this works, but for the most part, 70 years is the general rule. (
List of Copyright Expirations by Country)