Opera varia.

4 parts in 1 vol., 4to: [16]-776-[18] pp.; 56 pl. (engr. front.-portrait missing (as often) and replaced by a xerox-copy, some browning and spotting).

Contemp. blind-ruled and blind-st. calf, spine with raised bands, red leather title label (sl. rubbed, some stains and min. scratches on boards).

First edition of the collected works by W.J. 's-Gravesande containing Huygens' major works on physics and mathematics, i.a. dealing with clocks, the rings of Saturn, geometry and optics. Ill. with 2 identical engr. vign. on title and 56 fold. engr. pl. Including "Tractatus de lumine" which proposed that light travelled in waves, and his article on the pendulum clock "Horologium oscillatorium". Title in red & black.
Ref. Bierens de Haan 2238. - Houzeau & Lancaster 3428. - Hoogendoorn Huy20. - Poggendorff I:1165. - STCN.
Prov. Mod. booklabel on front pastedown.