T_|-3 Mr, Bentham's Patent Method 



prefepvc our o^l-paintings, many valuable pieces would bW 

 guarded from the deftruclive influence of the light and 

 phere, \vhich ch ry thing; infects would be pro- 



Lc6ted from bain f] >ti d with dufh, which greatly injure 

 their tints; and in particular we ftiouH prevent that damage 

 which the common refinous varnifhes occasion, though with 

 flow fteps, as thefe varnifhes not only become black of them- 

 kdves with lime-, butj as they contract in drying, and.,- becoming 

 bard, thej produce rents and cracks, and confequently brin'g 

 the painting, which it is wifhed to prefervcj fooner to de- 

 itruction. Elefinous varnifhes are naturally ( till' and un- 

 nliablc, and die materials on which moft new paintings are 

 found are hygromctric fub (lances, which contract or expand 

 in proportion to the drynefe or moifture that prevails in the 

 atmofphere. If it be true, as Oberlin obferves, that the 

 varnifl di moriconi) has rendered many beautiful 



ings fcafv, which -were taken from the ruins of Hercu- 

 m in good condition; what deltruction mufl it not 

 occafion in paintings on wood and canvas! Giufeppe 

 Piazcnza alfo makes a very pa nark on this circuvn^ 



ilancc. Bui I do not fay this with" a view to ofiend thofe 

 judicious and meritorious perfnns who go to work with pru- 

 dence and tkill, as I have no other object in riiy obfervations, 

 than to place in a proper light the antiquity and fuperiority 

 of wax-painting. 



VIU. A i the (l New Method of performing and 



facil f$ of divers mariufa&uring and econo- 



mical Proceffes" for ivhich a Patent, dated 2,4th June 1795, 

 ;: ,.' granted to '- Samuel Ruxtii a m, Efq. of Queen's-* 

 . r." 



A ER firice the days of Bacrfn, the philbfbphefs of Europe* 

 }wt employed tiicmfelves in determining, by actual expe- 

 piments, the phvfical properties of matter, and the laws to 



.vhic.h- 



