A representation of a coal-pit when working [graphic][January 1765]engA diagram showing the cross-section of a coal mine and the use of horses to raise coal from a pitTitle engraved below image.Plate from: London magazine. Or, Gentleman's monthly intelligencer. London : Printed for R. Baldwin, v. 34 (January 1765)."Engraved for the London magazine."--Above image.Partial watermark along the right edge.