John R. Siddall

Portrait of James Brown John R. Siddall

Portrait of John Tyndall (1820-1893) Henderson of Halifax

Silldal Anonymous

John A. Sidell, ca. 1830 John Vanderlyn

Portrait of John Tyndall (1820-1893) John McLure Hamilton

Physicist John Tyndall Anonymous

John Tyndall, DCL, LLD, FRS, Professor of Natural Philosophy at the Royal Institution Lock & Whitfield

Portrait of John Tyndall (1820-1893) Victor Zippenfeld

Rydal, 1812 John Harden

Professor John Tyndall, Irish natural philosopher Cassell

Professor John Tyndall FRS Anonymous

Captain John Waddell, 1750 John (after) Wollaston