Inclining Analemmatic Dial, attributed to Thomas Tuttell, London, c. 1697

Design almost identical to that published by Tuttell. Rectangular plate hinged to fold in half; one half carrying horizontal (inclining) dial with sprung folding gnomon with integral plumb level for 30-80° (plummet missing); the other half carrying the azimuth dial with folding gnomon on cursor moving against a combined calendar, zodiac and declination scale. Three edges of this half-plate are marked as a rectangular protractor and there are two levelling screws. On the reverse of this half plate is a perpetual almanac 1697-1758.