398 SEC. 11. ASTRONOMY. 



1772. Azimuth Quadrant, constructed by Metz in 1700. 

 H. G. Van de Sande Bakhuyzen, Director of the Observa- 

 tory, Ley den. 



1722a. Davis' Quadrant or Back Staff. The first marine 

 instrument for taking altitudes of the sun with reference to the 

 visible horizon. This instrument was the prelude to Hartley's 

 quadrant and the reflecting sextants and circles of the present day. 

 The property of the Royal Astronomical Society, presented by 

 ft. J. Lecky. Robert J. Lccky, F.R.A.S. 



1773. Astronomical Quadrant, said to have been the 

 property of Napier of Merchiston, the inventor of logarithms. 



University of Edinburgh. 



The telescopes attached are evidently of much more recent and clumsy 

 workmanship than the instrument itself. They are reported to have been 

 added by a " college bailie " (in the days when the university was under the 

 government of the town council), who fancied that he was thereby enhancing 

 the value of his gift to the university. 



1774. Quadrant, by Butterfield, of Paris. 



Kew Committee of the Royal Society. 



A brass quadrant, on a wrought-iron pedestal, carrying a telescope, with 

 object glass \ in. in diameter, and 2 ft. 3 ins. focal length. The quadrant is 

 divided with a diagonal scale, and is provided with a case for hanging a plumb- 

 line. 



1775. Quadrant, formerly belonging to Tycho Brahe. 



Royal Museum., Cassel (Director, Dr. Pinder). 



This instrument is the astronomical quadrant of Tycho Brahe. The 

 altitude quadrant, as well as the azimuth divided circle, are made of brass ; 

 the first is divided into sixths of a degree, the second into whole degrees, 

 which can be read by a simple pointer, but without verniers. The radius of 

 both circles is 40 cm., and the stand is constructed of cast iron. 



1776. Two Quadrants, with double sights, old ; the property 

 of H.H. Prince Pless, Furstenstein. The Breslau Committee. 



1777. Quadrant, for the observation of the height of the 

 sun, old ; the property of H.H. Prince Pless, Furstenstein. 



The Breslau Committee. 



1779. Small Semicircle, with double sights, for observing 

 the heights of the sun, old; the property of H.H. Prince Pless, 

 Furstenstein. The Breslau Committee. 



1777a. Quadrant, by Langlois. Paris Observatory. 



' 1778. Pillar Sextant, on stand, with artificial horizon. 



John Browning. 



These instruments are intended for use in an observatory, or otherwise on 

 land, for the purpose of obtaining accurate time. 



