Brass sector, by Butterfield
Universal equinoctial ring sundial, astronomical ring dial
1628-1724
Folding rule
1680-1699
Silver sector
1740-1760
Semicircular protractor
Astronomical quadrant with stand, 1685-1724
1685-1724
Sector by Butterfield
1680-1724
Pocket sun dial with folding gnomon and case
1678-1724
Gunner's level
Horizontal Butterfield-type sundial, in shagreen covered case
1678-1724
Sundial
1700-1725