20 leaves, 4to (283 x 183mm). Written in ink in brown cursive. Illustrated with 7 pen-and-ink drawings of dials and several tables. Modern marbled wrappers. 

 

A practical manual on dialing with seven problems for making accurate sundials: “To draw an equinoctial dial or an horizontal dial under the poles,” “To draw a horizontal dial under the equinoctial,” “To draw a horizontal ideal for any latitude,” and how to draw direct dials in each of the four directions (South, North, East and West.