Papers on charts, tables and books by Samuel Dunn.

A series of charts, tables and book by Samuel Dunn used to teach people how to find Longitude on behalf of the Honourable Committee of Shipping which Samuel Dunn would then give them a certificate for when completed. Including a book titled 'An introduction to the Theory and use of the Pantograph, showing the nature of its construction and the manner of using it in the copying drawings of figures, ornaments, plans, maps, charts, etc.' by Samuel Dunn; a bound series of charts and drawings relating to find Longitude at sea including Hadley's Sextant, the Paratactic triangle, a list of the names of lunar spots, observations and appearance of Jupiter and the Satellites and method of delineating an harbour; images of compases and two map of the moon.

Administrative / biographical background
A pantograph is an instrument for copying a plan or drawing on a different scale by a system of hinged and jointed rods.