394 Defer tption and Ufe of 



his oljfervations. It is by the projetlion of the fhaJows 

 formed by thefe mountains when they begin to appear on 

 their horizon in regard to us, or when they are about to 

 difappcar below the horizon. He diftinguiflies th? fuoun- 

 tains into differeut orders. 



The plate in Schroeter's work confifted only of outline, and 

 heexprefled the diameter of the three globes merely byftraight 

 lines. The annexed delineation (See Plate VIII.) was drawn 

 by Alexander Faujas,, the fon, who to militajry talents unites a 

 ftrong attachment to the fcieuccs. He has rendered the heiglu 

 of the mountains more juft, and, from his drawing, the refpec- 

 tive magnitude of the three globes can be belter eilimated. 

 It is here feen that the moon, which is about forty -ninft 

 times fmaller than the earth, has mountains more than 

 4000 toifes in height * ; while that of Chimboraco, one 

 of the Andes in South America, the higheft mountain of 

 our globe, is little more than 3000. V^cnus, which is lefs 

 than the earth by a ninth, has mountains 23,000 toifes 

 , in height. It rauft here be remarked, that the highefl; 

 inountains on thefe three globes appear all ta be Yolcar^ic. 



JSlIII. Defcription and Ufe of a new Fortahle Inflrument for 

 afcertainmg t^e Comparative Strength of Gmi-Poivder, 

 Bj C. Regnier f. 



I 



N the procefles employed for the improvement of gunr 

 powder, it is neceflaiy to make comparative experiments; 

 and various ingenious inventions, which it is unnecefiary to 

 defcrihe, as they are well known, have been ufed for that 



* The Freneh toife is^ to the Englifh fathom as i to ro664. 



■f From NUmorres explicutifi ilu Dynameter et aittres Mach'nns tnventeet 

 parC-Regniir, 410, Paris, An. VII. The inftrunoents here defcribcd are, 

 :(. The dynamoraeter, of which a plate and defcription were given in th^ 

 Philofopbical Magszins for September 1 798 ; 2. A faftguard for the prim- 

 ing ia mufketsi ^. The pcwder-pioof abcve-mcnticritd ; and, 4. An elec- 

 's'if.^ macivine. 



purpofe. 



