^2S STATUE OP JOAN OK ARC 



Uhilc ft;el ex- plalina and of palladium ; and obferving that the compound 

 p»nds throut'li piaie^ vvlien healed, became concave on the fide of the platina, 

 lxp?tU^g"\nd I afcertained that the expanfion of palladium is in fome degree 

 palijiiium 10. fl^e greater of the two. By a (imilar mode of comparifon I 

 found that palladium expands confiderably lefs than fteel by 

 heat; fo that if the expanfion of platina between the tem- 

 peratures of freezing and boiling water be eftimated at 9 parts 

 in 10,000, while that of ftee! is known to be about 12, the 

 expanfion of palladium will probably not be much more or 

 lefs than 10, or one part in 1000 by the fame difference of 

 temperature. 



It muft, however, be acknowledged, that the method I 

 have purfued is by no means fufficient for determining the 

 precife quantity of expanfion of any fubftance ; but I have 

 not been induced to beftow much time on fuch an inquiry, 

 fince the extreme fcarcity of palladium precludes all chance 

 of any praftical utility to be derived from a more accurate in- 

 veftigation. 



VI. 



Report tnade to the AthenSe des Arts of Paris, hy MM. RoN- 

 DELET, Brauvallet, and Duchesne; on the founding 

 the Statue of Joan of Aac in Bronze , br/ a Way never he- 

 fore vfcdfor large Works, by MM, Rousseau and Genon, 

 vnder the Diredtion of M. Gois, Statuary * 



Caftlng In fand -"- HE method of cafting in fand hitherto has only been ufed 

 enh^ir^r% ^^^ '"igures from 65 to 70 centimetres (about 2^ feet) in 

 figures. heighth ; while the ftatue, which was to be formed, being of 



much larger dimenfions, fliould of courfe be managed accord- 

 ing to the method called the great foundery, on account of its 

 being ufed for colotTal ftatues. 

 The great foua- This method of cafting was known to the ancients, who 

 th^andcrt" '° ^'^"^^ ^^^" fuperior to us in it ; but this art was loft with many 

 but was loft. Others, and in the time of the Medicis large ilatues were not 

 At its rcvivil formed at a fingle cafting. The figures of Henry the Fourth 

 wSSlTn fc ^"^ °^ ^^^^^ ^^® Thirteenth, which are feen at Paris, were 



pirate parts. 



Magazin Encyclopedique, T. I. p. 350, 



phced 



