Signedprinted in black on white instrument face: THE NAVIGRAPH / PATENT APPLIED FOR / NO. 505 / H. HUGHES & SON / 59 Fenchurch St. / LONDON
small ivory label: MADE IN ENGLAND FOR THE ONTARIO HUGHES OWENS Co. LTD. OTTAWA, CANADA
FunctionNavigraphs are a form of sextant that are mounted in a horizontal orientation for tracing the position and direction of a ship with respect to landmarks, to plot the ship's course on a chart.
ProvenanceInstitute of Geographical Exploration, retrieved 1955.