A photograph of a man with a pocket laboratory, taken in October 1937 by Saidman for the Daily Herald. Shown at a medical exhibition held at London's Horticultural Hall, this laboratory contained enough chemicals for 2500 tests at a cost of one farthing each.

A photograph of a man with a pocket laboratory, taken in October 1937 by Saidman for the Daily Herald.

Shown at a medical exhibition held at London's Horticultural Hall, this laboratory contained enough chemicals for 2500 tests at a cost of one farthing each.

Two Saidman brothers, Reuben and Barnet, worked as staff photographers for the Daily Herald. Their photographs are simply stamped 'Saidman' on the reverse, making it difficult to tell which of the brothers took the photograph.