ROS 



ROS 



H is a Aider, fitted to the ftandard H, and moved by a (err w : 

 r is a wheel fixed to this Aider, and having feveral half-circle 

 cavities cut in it, which embrace the fcrew, as fhewn in jig- 10 : 

 each cavity or focket has a thread in it, correfponding with 

 the regulator fcrew. The mandrel being made, as before- 

 mentioned, with cylindrical collars at each end, is at liberty 

 to Aide endways by the movement of the regulator, when 

 the fcrew H draws up the focket r ; therefore, every thing 

 being prepared for cutting the thread, the fcrew H is turned ; 

 this raifes up the Aider, and focket r, to touch the regulator ; 

 the tool is then applied by the Aide-reft, and the lathe being 

 put in motion, the mandrel will move along endways, and 

 alfo the work with it, fo that the tool will cut a fcrew, al- 

 though it is held faft by the relt. In this cafe the fcrew 

 may be cut by a (ingle pointed tool, but it will be better to 

 ufe a fcrew tool which is of exa&ly the fame thread as the 

 regulator. The turner ftiould be provided with a variety of 

 fets of fcrew tools, and as many regulators, o, correfponding 

 to them, which are made like a tube, and fitted on the man- 

 drel, being held by a nut. The focket r, which is made like a 

 wheel, jig. 10, can be turned round on its centre, and has 

 fix different half-circle notches cut in it, each adapted to a 

 particular regulator ; therefore, by turning this wheel, /-, any 

 of the notches can be applied to the regulator o, when the 

 Aider is raifed up by the fcrew H. This fcrew regulator may 

 be fometimes ufed to advantage when ornamenting the cir- 

 cumference of a cylinder of wood or ivory, as contiguous 

 circles, or waved lines, may then be cut in a fpiral direction, 

 without moving the Aide-reft to cut each one feparately. 



Another part of the rofe engine is for the purpofe of 

 turning fwafrt work ; this is circular work, but the mouldings 

 or other lines traced round the cylinder are inclined to the 

 axis. An inftance is feen in the baluilrades of old-faftiioned 

 flair-cafes, where the mouldings are made to fuit the in- 

 clination of the flairs. To turn this kind of work, a (teel 

 circle, or hoop, V, is fitted on the end rofette of the man- 

 drel, fo that it can be inclined from the perpendicular thereto 

 at pleafure : by this means it forms a guide for the pumping 

 motion, which will fo regulate it as to turn any work of this 

 kind, viz.. with the mouldings, or other ornaments, arranged 

 in lines round the cylinder, but thefe lines will incline to the 

 axis of the cylinder inftead of being perpendicular to it. 



Rose, in Geography, a town of Naples, in Calabria 



Citra; nine miles N.N.E. of Cofenza Alfo, a town of 



Virginia ; 20 miles S.W. of Charlotteville. 



Rose //lands, Great and Little, two fmall iftands among 

 the Bahamas ; 12 miles N. of Providence. 



Rose IJland, an lAand in the North Pacific ocean, near 

 the W. coaft of America. N. lat. 59 35'. W. long. 

 146 30'. 



ROSEA, a name given by fome authors to the eryfipelas, 

 or St. Anthony's fire. 



ROSEAU, in Geography, now " Charlotte-town," the 

 capital of the ifiand of Dominica, fituated in St. George's 

 parifh ; about feven leagues from Prince Rupert's bay ; on 

 a point of land on the S.W. fide of the iAand, which forms 

 two bays, vis. Woodbridge's bay N., and Charlotteville 

 bay S. Rofeau is about half a mile in length from Charlotte- 

 ville to Rofeau, and moftly two furlongs in length, but of 

 an irregular fhape. It contains more than 500 houfes, be- 

 fides cottages occupied by negroes. N. lat. 15° 25'. W. 

 long. 6i° 27'. 



ROSECK, a town of the duchy of Carniola ; eight 

 miles E. of Gottfchee. 



ROSEHEARTY, a fifhing town and fea-port of Scot- 

 land, in Aberdeenfbire, with a tolerable harbour ; for the 

 •Hiprovemerit of which lord Gardenltone bequeathed by will 



a conliderable fum of money ; four miles W. of Frafer- 

 burgh. N. lat. 57 38'. W. long. 2°. 



ROSEINGRAVE, Thomas, in Biography, an en. 

 thuiiaftic, ingenious, and worthy mufician, of confiderable 

 eminence in his youth for his performance on the harp- 

 fichord and organ, both as a fightfman and voluntary 

 player. His intellects, in the latter part of his life, being 

 fomewhat deranged, rendered his character fo fingular, that 

 he merits iome notice for his eccentricities, as well as pro- 

 faffmnal abilities. 



He was the fon of Daniel Rofeingrave, who having been 

 brought up in the king's chapel at the fame time with 

 Purcell, was firft promoted to the place of erganift of 

 Salifbury cathedral, and afterwards of St. Patrick's, Dublin. 

 Daniel had two fons, both muficians : one of them, Ralph, 

 fucceeded his father at St. Patrick's; the other, Thomas, 

 being regarded as a young man of uncommon difpofitions 

 tor the ftudy of his art, was honoured by the chapter of St. 

 Patrick's with a penlion, to enable him to travel for im- 

 provement ; and about the year 17 10 he fet off for Italy. 

 Being arrived at Venice in his way to Rome, as he himfelf 

 fays, tie was invited, as a tlrjiiger and a virtuofo, to an 

 academia at the houfe of a nobleman, where, among others, 

 he was requefted to lit down to the harpfichord, and favour 

 the company with a toccata, as a fpecimen della jua virtu. 

 And, fays he, " finding mylelf rather better in courage 

 and finger than ufual, I exerted myfelf, my dear friend, 

 and fancied, by the applaufe I received, that my perform- 

 ance had made fome imprefiion on the company." After a 

 cantata had been fung by a fchelar of Fr. Gafparini, who 

 was there to accompany her, a grave young man drefled in 

 black, and in a black wig, who had itood in one corner of 

 the room, very quiet and attentive while Rofeingrave 

 played, being afked to fit down to the harpfichord, when 

 he began to play, Rofy faid, he thought ten hundred d — Is- 

 had been at the inftrument ; he never had heard fuch pal- 

 fages of execution and effect before. The performance fo 

 far furpaffed his own, and every degree of perfection to 

 which he thought it pofiible he fhouid ever arrive, that, if 

 he had been in fight of any inftrument with which to have 

 done the deed, he ftiould have cut off his own fingers. 

 Upon inquiring the name of this extraordinary performer, 

 he was told that it was Domenico Scarlatti, fon of the 

 celebrated cavalier AlefTandro Scarlatti. Rofeingrave de- 

 clared, he did not touch an inftrument himfelf for a month. 

 After this rencontre, however, he became very intimate 

 with the young Scarlatti, followed him to Rome and 

 Naples, and hardly ever quitted him while he remained in 

 Italy, which was not till after the peace of Utrecht, as ap- 

 pears by an anthem which he compoled at Venice in 1713, 

 and which Dr. Tudway has inferted in the fifth volume 

 of his Manufcript Collection of Englifh Mufic, p. 149 : 

 " Arife, fhine, for thy light is come," Ifaiah, chap, Ix. 

 There is much fire and fpirit in the introductory fymphony 

 of a very modern caft. Rofeingrave is here erroneouAy 

 called a ftudent of Chrilt-church, Oxford, inftead of Dublin, 

 whence he had his exhibition. 



On his return from Italy in 1720, he fettled in London, 

 and brought on the itage and conducted the performance of 

 the opera of " Naicifo," or " NarcifTus," fet by his friend 

 Domenico Scarlatti ; being the third opera that was per- 

 formed in our lyric theatre, after the eftablifhment of the 

 Royal Academy of Mufic. He compofed feveral addi- 

 tional fongs for this opera, in which the fingers were fignor 

 Benedetto BaldafTarri, Mr. Gordon, fignora Duraftanti, 

 Mrs. Analtafia Robinfon, Mrs. Turner Robinfon, daugh- 

 ter of Dr. Turner, and wife of Mr, Robinfon, organift of 

 1 2 Weftroinfter- 



