1. P.P.1931.pch, 2(3) Reference (shelfmark): P.P.1931.pch, 2(3) Title: Professor Tyndall. Photographer: Lock and Whitfield Scope & Content: Genre: Portrait Photography Oval image; head-and-shoulders full-face portrait of the natural philosopher and populariser of science John Tyndall (1820-1893). Collection Area: Printed Collections Languages: Not applicable Date Range: c 1877 Extent: 1 item