TELESCOPES 21 



I 



Both stands are reminiscent of Revel's stands (1673) (v. Machina 

 coelestis, pi. x). A similar device is figured in the Hist. Coel., as in use 

 at Greenwich in Flamsteed's time. Cf. fig. in Maunder's R. Observ. 

 Greenwich. 



SURVEYING INSTRUMENTS 



98. Plumb Level and Clinometer. c. 1579. 



Bodleian Library. 



Brass gilt and engraved with Arabesque ornamentation. With 

 pin-hole sights. 9^ inches wide. 



Probably presented by Josias Bodley with the Schissler geometer's fcA-v/^dW 

 Quadrant stated to have come into the Library in I6I3. 1 An oak box 

 fits both instruments. 



The plummet (missing) was hung in the centre of an arc of 5|-inch 

 radius, graduated to 90 on each side of the normal. The two sights 

 are hinged for packing. 



Although this instrument does not appear to have been made by | v r^fw*^ 



the same hand as the Schissler Quadrate, it was probably used in 

 connexion with it, for the oak Quadrate-case which appears to date from 

 the i7th century, is recessed for its reception. 



Early treatises on surveying are frequently illustrated with excellent 

 pictures showing the method of using quadrants and quadrates. 

 A good example, Bodleian S. C. 2177, of about the year 1275 shows 

 clearly how the height of buildings may be measured. 



99. Geometer's Quadrate in gilt brass frame 13! inches square. 1579. 

 Packed in an oak box which is also fitted to hold a clinometer. 

 Inscribed on back 



Christophorus Schissler Geometricvs ac 



Astronomicvs Artifex 



Augustae Vindelicorum faciebat anno domini 1579 



Presented by Josias Bodley to the Bodleian Library. 

 It is said to have come into the Library in 1613. 

 A beautiful example of this master's art. It was formerly regarded 

 as one of the sights of the Library, and was kept in a cupboard in the 

 wooden stand of the Armillary Sphere. Uffenbach saw it on Aug. 19, 

 1710, and was told by Crab the sub-librarian that it was made of pure 

 gold. 



1 Bodleian Library copy of Macray's Annals of the Bodleian. 



