The Countess of Westmorland's lodestone, encased in a display cabinet, now
housed in the British Museum, depicted in an engraving of 1756.
The caption reads: "MAGNES rarisime: Magnitudinis, quem Illustrissima Dom:
Dom: Cometessa de WESTMORLAND: Academiae OXON. donavit et in MUSÆO
ASHMOLEANO reponendum esse voluit. A.D. 1756."