Observatoire de Kew : photographies du soleil, instruments magnétiques. portable Magnetometer, Kew pattern as arranged for deflection [fig. 1] ; portable Magnetometer, Kew pattern as arranged for vibration [fig. 2] ; Dip Circle, Kew pattern [fig. 3] ; Barrow’s Dip Circle with Lloyds apparatus (fig. 4) ; Foy’s Circle (fig. 5) (titre original)

De la Rue, Warren (1815-1889), “Observatoire de Kew : photographies du soleil, instruments magnétiques. portable Magnetometer, Kew pattern as arranged for deflection [fig. 1] ; portable Magnetometer, Kew pattern as arranged for vibration [fig. 2] ; Dip Circle, Kew pattern [fig. 3] ; Barrow’s Dip Circle with Lloyds apparatus (fig. 4) ; Foy’s Circle (fig. 5) (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 2 mai 2024, https://bibnum.obspm.fr/ark:/11287/10Kbj.