Standard 6" diagonal scale in case; brass 6 7/8" x 3 7/16" screwed by 4 screws to mahogany base with a mahogany cover

Rectangular drawing instrument in brass

1865

Semi-circular protractor by Henry Sutton

1655

Diagonal scale, metal 6 1/2" by 2 1/2"

1876

Three diagonal scales

1731-1770

Rustless steel scale (40 3/4" x 2 7/10" x 1/8") one bevelled edge divided to 1/10 inch

1929

Diagonal scale, screwed to mahogany base

3-foot brass scale

1851-1876

Plotting scale

Rectangular diagonal scale