310 PROCEEDINGS OP THE AMERICAN ACADEMY 



for the Applications of these Pressures in order to prevent any sensible 



Alteration of the Length of the Bar by small Flexure. Astronomical 



Transactions, Vol. XV., page 157. 

 F. G. W. Struve. — Arc du Me'ridien de 25° 20' entre le Danube et la mer 



glaciale mesure depuis 1816 jusqu'en 1855. St. Pe'tersbourg, 1860. 

 Delambre et Me'chain. Base du System Me'trique. Tome III. 

 Annales du Conservatoire des Arts et Metiers. Rapport sur la Revision des 



Etalons en 1807 et 1868. Tome IX., No. 33. 

 Atlas des Poids et Mesures dresse en Execution de l'Ordonnance Royale. 



Paris, 1839. 



Philosophical Transactions of the Royal Society. 



An Account of the laying down of the Measure of Three Feet from the Tower 

 Scale upon the Brass Bar of the Royal Society, and Comparison of the 

 Yard with the Half-Toise. 1742-43, page 185, &c. 



Comparison by Graham of the Royal Society's Standard denned by two Points; 

 the Exchequer End-standard reputed to be the National Standard; the Ex- 

 chequer Standard-Beds ; the Tower Standard Scale ; the Guildhall Stand- 

 ard-beds and the Clock-makers' Standard-Bed. 1742-43, page 541, &c. 



Maskelyne's Account of the Maryland Degree. 1708, page 324, &c. 



Roy's Account of the Measure of the Base on Hounslow Heath. 1785, page 

 402, &c. 



Sir George Shuckburgh's Endeavors to find a Standard of Length. 1798, page 

 135, &c. 



Eater's Account of Experiments for determining the Length of a Pendulum 

 vibrating Seconds in the Latitude of London. 1818, page 33, &c. 



Kater on the Length of the French Metre as compared with Shuckburgh's Scale, 

 - 39.4 in. 1818, page 103, &c. 



Sabine's Experiments on the Length of a Seconds Pendulum. 1821. 



Eater's Comparison of various British Standards. 1821, page 75, &c. 



Eater's Account of the Preparation of the New (Secondary) Standards of 

 Weights and Measures. 1826. Part II. page 1, &c. 



Eater's Investigation of the Curvature of Bars, produced by the Inequalities of 

 the supporting Surface. 1830, page 359. 



Eater's Account of a Copy of the Imperial Yard made for the Royal Society. 

 1831, page 345, &c. 



Account of the Construction of the New National Standards of Length, and of 

 its principal Copies. By G. B. Airy, Esq., Astronomer Royal. 1857, page 

 621, &e. 



On the Indian Arc of Meridian. By Archdeacon Pratt. 1861, page 579, &c. 



On the Rigidity of Glass. By Dr. J. D. Everett. 1865, page 39, &c. 



On the Expansion by Heat of Metals and Alloys. By A. Matthieson. 1866, 

 page 861, &c. 



Abstract of the Results of the Comparisons of the Standards of Length of 

 England, France, Belgium, Prussia, Russia, India, and Australia, made at 

 the Ordnance Survey Office, Southampton, by Captain A. R. Clarke, R. E., 

 F. R. S., &c. 1867, page 161, & c . 



The Preparation in a State of Purity of the Group of Metals known as the 

 Platinum Scries, and Notes upon the Manufacture of Iridio Platinum. By 

 George Matthey. Proceedings, Royal Society, 1879, page 463. 



