Railroad Engine by Ehrgott & Forbriger c.1894. Original from Library of Congress. Digitally enhanced by rawpixel. Free Image from public domain license 
Human skeleton illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892 edition of… Free Image from public domain license 
Daggers and sheaths from the Industrial arts of the Nineteenth Century (1851-1853) by Sir Matthew Digby wyatt (1820-1877). Free Image from public domain license 
