6 DRAWING INSTRUMENTS 



as described in Arthur Haughton's book, a copy of which was 

 presented to St. John's College by George Barkham, to explain the 

 use of the instrument. 



This instrument is probably the oldest Slide Rule now in existence. 

 E. Gunter of Christ Church invented the straight logarithmic scale in 

 1620. Oughtred made the first logarithmic slide rule in 1630, and his 

 Circles of Proportion or circular Gunter scales in 1632. 



Standard Measure. 

 22. Gunter's Chain. 16 . 



Christ Church. 



Gunter's Chain contains in length 4 poles or 66 feet, and is divided 

 into 100 links ; each link is, therefore, in length y^j inches. 



PORTABLE SUNDIALS 



23. Chinese Sundial and Compass. 



Presented by W. Lloyd. Pitt-Rivers. 



24. Pocket Dial, Almanack, Compass and Tidetables. 1554. 



Bodleian Library. 

 Maker's initials, V. C. 



A most elaborate instrument and book of tables in gilt brass, with 

 a ring -for suspension. Both front and back are embellished with 

 engraved ornament. 1 



Front. In a square frame an ovoid boss with a coat of arms [ ], 

 three bars [ ], in chief [ ] as many roundels [ ]. Crest, 

 a buck on an esquire's helmet. Above in a pediment, two cherub heads 

 on a globe and two quadrants. 



Back. Motto in oval +Aske + me + 



+ not + for + ye + 



+ Gett + me + not + 



+ R + P + 



Under a pediment above, an astrolabe. One of the two cherub heads 

 is used as a catch. 



Round the edge is an engraved border that resembles the work 

 upon the book-dial (Brit. Mus. 88. 12-1. 294) and also appears on the 



1 The elegant style of engraved ornament upon the back and front of this 

 instrument was much in vogue, both in western Germany and in Holland, 

 during the second half of the i6th century witness the decorative frames 

 enclosing the titles of Eden's Arte of Navigation, 1561, or of the charts of 

 I. Wagenaer collected in Auregain, Speculum nauticum, 1583, and again in the 

 more finely executed plates by Theodore de Brij in A. Ashley's The Mariners 

 Mirror, 1588. 



