R P 



468 



Rope- p. 598, given a full account of the experiments of De- 



vol. 



Messrs. Mit- 



making. 



, and of the more recent and accurate ones of 

 -Coulomb, On the Friction and Rigidity of Ropes, we shall 

 conclude this article with two useful Tables, contain- 

 ing the length and weight of ropes and cables of 

 different kinds and sizes. 



TABLE I. Shewing the number of fathoms and feel in 

 a hundred weight of rope of any size under 14 inches. 



TABLE If Shewing the weight of 120 fathoms of any 



cable or rope for every half inch nf circumference, from 

 3 to 24< inches. 



Those who wish for farther information on the sub- 

 ject of ropemaking, are referred to the following 

 works : 



Dr. Hooke, in Birch's Hist, of Royal Society, vol. ii. 

 p. 393. Depontis, Id. 1739, Hist. p. 56. M. Duha~ 

 mel's Traile de la Corderie perfectionnee, 4to. Dr. 

 Robison, Encycl. Brit. art. Ropemaking. Mr. Balfour's 

 patent of 1793, Repertory of Arts, 1st series, vol. ii. 

 p. 14S. Mr. Huddart's patent of 1793, Repertory of Arts, 

 2d series, vol. iv. p. 81. Mr. Chapman's patent of 

 March 1798, Repertory of Arts, 1st series, vol. ix. Mr. 

 Chapman's patent of Nov. 1798, Repertory of Arts. 

 Mr. Curr's patent for flat ropes, Repertory of Arts, 1st 

 series, vol. x. p. 361. Mr. Mitchell's patent of 1799^ in 

 the Repertory of Arts, 1st series, vol. xi. p.. 302. Mr. 

 Huddart's patent of August 1799^ Repertory of Arjls, 

 1st series vol. xii. Mr. Huddart's patent of July 1800, 



Repertory of Arts, 1st series, vol. xiy. 

 chell's patent of 1802, Repertory of Arts, 2d series, 

 vol. viii. p. 241. Mr. Walker's patent of 1806, Reper- 

 tory of Arts, 2d series, No. 70. Huddart's Remarks on 

 the Patent Registered Cordage, Lond. 1800. Mr. Chap- 

 man's Treatise on the progressive endeavours to improve 

 the Manufacture and Duration of Cordage, Lond. 1808. 



ROPE MACHINE. See HYDRODYNAMICS, Vol. Xi. 

 p. 566. 



ROSA, MONTE, a short account of this celebrated 

 mountain has already been given in our article ALPS, 

 Vol. I. p. 581, Monte Rosa is the highest mountain 

 in Europe excepting Mont Blanc. From a mean 

 of various measures taken with accuracy, the height 

 of Mont Blanc is 2461.8 toises, while that of Monte 

 Rosa is 2373, whence it appears that Mont Blanc is onry 

 88 toises higher than Monte Rosa. Monte Rosa wa* 

 called by the ancients Mons Sylvius. The name of 

 Monte Rosa seems to have been first given to it by 

 Scheuchzer, in his Itinera Alpina, in 17021711 ; and 

 Baron Welden thinks that it derives its name from 

 the roseate tints which the first rays of the rising sun 

 throws on its whitened summits. 



The summit of Monte Rosa has not yet been reached 

 by any traveller. One Mayriard pretended that h 

 had accomplished this on the 13th August, 1813 ; but 

 his own account shows, that the point which he reached 

 was very far from the summit. Professor Parrot of 

 Dorpat, and M. Zumstein of Gressonay, made two at- 

 tempts in 1817, to ascend the highest peak ; but they 

 failed in both. In 1819, M. Zumstein ascended one 

 of its southern summits.* He made a second ascent 

 in August 1820, a third in August 1821, aud a fourth 

 and fifth in July and August 1822. 



The following is a Table of the heights of the diffe- 

 rent peaks of Monte Rosa. 



Paris Feet. 



Monte Rosa, 1st, or highest peak 14,223 

 2d peak 



3d peak 



4th peak 



5th peak 



6th peak 



Rop 

 Machine, 



14,154 

 14,028 

 12,984 

 13,630 

 12,981 



Baron Welden, an enterprising German traveller, 

 conceived the design of exploring and describing the 

 topography, the orometry, the geology, the natural his- 

 tory, and the botany of this mountain ; and he has ex- 

 ecuted this design with great ability in his work, enti- 

 tled Der Monte Rosa. Eine Topographische und jVa- 

 turhislorische S/cizze nedst einem Anhange der Von 

 Herrn Zumstein, gemachten Reisen zur Ersleigung sei- 

 ner Gipfef, Vienna, J 824. This work is accompanied 

 with a topographical chart of Monte Rosa and its en- 

 virons, on a scale of 3200 toises to a Paris inch, with a 

 map of the trigonometrical operations among the Alps, 

 and five lithographic views taken by the camera lucida 

 from the Lago D'orte, from Turin, from Vercelli, from 

 Gemmi, and from Rothorn. Besides giving an account 

 of the glaciers, torrents, rivers, and line of perpetual 

 snow on the mountain, Baron Welden has given a very 

 interesting account of the inhabitants of the adjacent 

 valleys, a German population of 9000 persons, who 

 have preserved their language and customs entire. He 

 has also added, as the title of the book expresses, an 

 account of M. Zumstein's ascents. See Dr. Brewster's 

 Journal of Science, vol. i. No. i. and vol. ii. p. 152. 



ROSA, SALVATOH, a celebrated painter, was born at 

 Naples in 1614. He received his first lessons in painU 



An account of this ascent will be found in Dr, Brewster's Journal of Science, vol. i. p. U 



