Autochrome by John Cimon Warburg (1867 -1931). Warburg was able to devote his time wholeheartedly to photography because bad asthma stopped him from working in a full time job and a private income gave him economic freedom. He excelled at the Autochrome process, giving lectures and writing extensively on the subject. Although never a member of The Linked Ring, he seems to have been something of a linchpin in the photographic world.
© Royal Photographic Society / Science & Society Picture Library