QUADRANTS 9 



RING DIALS 



36. Corean Sun Clock. Modern. 

 A wooden ring dial. Pitt-Rivers. 



37. English Ring Dial. c. 1680. 



Diameter i| inch. [5829. 1886] Ashmolean Museum. 



38. Ring Dial. i7th cent. 



Diameter i| inch. Professor Bowman's Coll. 



Found on Greenham Common near Newbury. 



/ shew y e time 



ify* Sun shine 



Other specimens exhibited belong to the Pitt-Rivers Collection. 







QUADRANTS 



39. Sacrobosco's Quadrant. 



Figure copied by Delambre, fig. 54, from the i4th cent. MS. Bibl. 

 nat. Paris lat. 7196, ff. 25-27**. 



' Tractatus magistri lo. de Sacrobosco super compositione quad- 

 rantis simplicis et compositi et utilitatibus utriusque et.' Beg. : ' Omnis 

 scientia per instrumentum operativa.' Ends : ' et hec michi dicta de 

 simplici et composite quadrante sufficiant' 



40. John of Montpellier's Old Quadrant. 



Radius 5^ inches. f. 72, MS. Ashmole 1522. 



An excellent figure drawn before 1350. 



41. John of Montpellier's Old Quadrant. 



Radius 4! inches. f. 117, MS. Bodl. 472 (S. C. 2492). 



A roughly executed figure by Tristrandus of Louvain, 1437. 



42. New Quadrant of Profacius. 1301. 



MS. Ashmole 1522 (temp. Edw. II), ff. 122-132. 

 MS. Digby 17 (isth cent.), ff. 160, 164. 



Bodleian Library. 



43. Quadrant. c. 1301-1350. 



Bronze. Radius i foot. Merton College. 



From the lettering this quadrant has been considered to be the oldest 

 of the astronomical instruments belonging to Merton College, and this 

 is confirmed by the coincidence of the first point of Aries with the i3th 

 of March in a circular scale on the back of the instrument. 



44. Sinecal Quadrant. Date of figure c. 1400. 



S. C. 2142. MS. Bodley 68, f. 48. 



45. The Quadrant of Robert Recorde. 1596. 



Figured in The Castle of Knowledge, p. 52. 



