CATALOGUE. PRACTICAL ASTRONOMY, GEOGRAPHY. 



359 



Clairaut on the measurement of the earth by Frisii disquis tio de figura et magnitudine 



several arcs. A. P. 1736. Il6. telluris. Milan, 175(2. 



*Clairaut de tcrrae figura. Pli. tr. 1737- 19- Short's remiirks ou Frisi. Ph. tr. 1753. 5. 



*Clairaut on the figul-e of planets of unequal Eukr on spheroidical trigonometry. A. Beri. 



density. Ph.tr. 1738. XL. 277- 

 The earth probably denser at the centre, as Newton hint- 

 ed : but Newton made a little mistake respecting its eflfccl 

 Clairaut sur Ja figure de la terre. 8. Paris, 



1743. 



Ace. A. P. 1742. H. 86. 

 Bradley on observations of pendulums by 



Graham and Campbell. Ph. tr. 1734. 



XXXVlIl. 302. 



1753. 258. 

 Darcy on the attraction of spheroids. A. P. 



1758. 318. 

 Reflections on the figure of the earth. A. P. 



1755. H. 47. 

 *Grischow's experiments on the length of 



the pendulum. N. C. Petr. VII. 445. 

 Prefers a simple pendulum, corrected for temperature, to a 

 compensation. 



Maraldi on the verification of the figure of Maskelyne on the going of a clock at St. 

 the earth by the^iunar parallax. A. P- Helena. Ph. tr. 1762. 434. 



1734. l.H. 59. 

 Bouguer's comparison of the supposed figures 



of the earth. A. P. 1734. 21. H.,83. 

 Bouguer on the measurement ot degrees. A. 



P. 1736. 302, 443. 

 Bouguer on the direction of the plumb line. 



A. P. 1754. 250. H. 1. 

 Stirling on the figure of the earth, and the 



variation of gravity. Ph.tr. 1735. XXXIX. 



98. 

 Krafft on the figure of the earth. C. Petr. 



VIII. 220. 

 Delisle on a measurement in Russia. Ph. tr. 



1737. XL. 27. 

 Celsius de figura telluris. 4. Upsal, 1738. 



Ace. by Eames. Ph. tr. 1740. 371. 

 Alexander on a plan for measurement in 



New York. Ph. tr. 1740.383. 

 Examen des ouvrages faites pour determiner 



la figure de la terre. 8. Amst. 1741. M. B. 

 Wargentin on the figure of the earth. Schw. 



Abb. 1749. 243. 1750. S, 83. 

 Lacaille on the true length of the degrees in 



France. A. P. 1751. 425. H. 158. 



Maskelyne. Ph. tr. 1777. 722. 



Corrects for curvature and refraction together, by dividing 

 the square of the distance by J of the diameter of the earth. 



•f'Michell on measuring degrees of longitude. 



Ph.tr. 1766. 119. 

 Lambert on the figure of the ocean. A. Berl. 



1767. 20. 

 Liesganig's measurement of 3° in the meri- 

 dian of Vienna. Ph. tr. 1768. 15. 

 South of Vienna the degree was 186 loises less than north- 

 wards towards Brunn, but at Warasdin 300 toises greater 

 than at Vienna : this is attributed to the attraction of moun- 

 tains near Graz. 



Mason and Dixon's measurement of a de- 

 gree in Pennsylvania. Ph. tr. 1768. 270. 



Lat. 39° 12'. Cavendish calculates, that the degree may 

 have been diminished 60 or 100 toises from the situation of 

 the Atlantic and the eflfect of the Allegany mountains; similw 

 causes may have operated in Italy and at the Cape. 

 Mason and Dixon on the going of a clock 



in Pennsylvania. Ph. tr. I768. 329- 

 Dalembert on the change of axis from a dif- 

 ference of meridians. A. P. 1768. 1. H. 

 95, 332. 

 On the length of the pendulum. N. C. Petr. 

 XIV. ii. Snmm. 14. 



Lacaille on the precision of the measures of Mallet's observations in Lapland. Ph.tr. 1770, 

 1740. A. P. 1755. 53. 363. 



