МАЭ № 7823-12. МЛ-447

Davis's quadrant

first half of the 18th cent.

palm wood

length 75.5

Quadrant includes two arcs 22 and 72.5 cm in radius. Degree scale with divisions in 1° and numbering in two directions: 0-65 through 5 and 25-90 through 10 is on the smaller arc. On the face side of greater arc is degree scale with divisions in 10 and transverse scale for readings 0°,1. Numbering in 1° in two directions: 0-25 and 65-90. On the reverse side of the greater arc are: 2 calendar scales of North and South solar declination; degree scale of declinations with divisions in 1/4° (0-20°) and 5' (20-23°,5); Zodiac scale (0-30°) with divisions in 1/2°; equidistant scale 0-90.

History of Science Monuments. 14th-19th centuries. Mikhail Lomonosov Museum