T E S 



Jience. as the as coBtained twelve ounce*, the teruncius con- 

 tained three, whence the name, which is formed of the Latin 



tres uncit. r , . 



Teruncius was alfo ufed for tlie quarter oi the denanus, 

 fo that when the denarius was at ten afTes, the teruncius 

 was worth two and a lulf; and wlicn the denanus was 

 rifen to fixtecn, the teruncius was worth four. See Dk- 



TERVOLA, in Geography, a town ot ISweden, in the 

 Lapmukof Kemi ; ii6mile8N. of Kemi. 



TERWALDE, a town of Holland, in the department 

 of Guelderland; 12 miles S. of Hattem. 



TERZA, La, a town of Naples, in the province of 

 Otraiito ; l.^ miles S.E. of Matera. 



Terza, ital. the 3d in Muftc. The ter-^a maggiore, or 

 major 3d, is four femitones, or half notes, above the bafe ; 

 tiie terz.a m'more, or minor 3d, is three. See Concords and 

 Intervals. 



-©- «-e- 



T E S 



TERZETTO, in tiie Italiati Mufu, a little tune or air 

 in three parts. Sec Tuio. 



TERZINI, Ital. implies, in tlie language of praftical 

 muficians, triplets, or three notes in the time of two. 



TERZO SuoNO, Ital. the third found, difcovered by 

 Tartini to be produced in the medium by two founds that 

 can be fuftaincd, and which third found is the true funda- 

 mental bafe. Upon tliis harmonic phenomenon Tartini has 

 founded his fyftem ; and Mr. Stillingfleet, in his " Principles 

 and Power of Harmony," defcribes the terzo fuono in the 

 following manner. 



"Two founds being given on any mufical inflrument, 

 which will admit of being held out for any time, and of 

 being ftrengthened at pleafure, as in the trumpet, the Ger- 

 man horn, the violin, hautbois, &c. a third found will be 

 heard. On the violin, let the notes C E, C* E, B E, 

 B G, Bb G, be founded with a ftrong bow, the third 

 founds will "be heard in the following manner. 



•' The fame thing will happen if the fame intervals are 

 founded by two players on the violin, diftant from one an- 

 other about twenty-nine or thirty feet ; always ufing a 

 ftrong bow, and holding out the notes. The auditor will 

 hear the third found much better, if placed in the middle 

 between them, than if nearer to one than the other. Two 

 hautbois produce the fame effefl placed at a much greater 

 diftance, and even when the hearer is not in the middle, and 

 ftill more if he is." 



Tartini has been unfairly treated by d' Alembert, M. Serre, 

 and other French writers, who not only difpute his fyftem 

 built on the ter%o fuono, his own difcovery, but give the dif- 

 covery itfelf to another. 



D'Alembert accufes him of writing in a manner fo ob- 

 fcure, that it is impoflible to form any judgment of his in- 

 tentions ; yet he is obliged to own that the fubjeft itfelf is 

 obfcure, metaphyfical, and uncertain. As to the obfcurity 

 in the phenomenon itfelf, we deny it ; the third found, pro- 

 duced by two other founds, we have always found, from 

 innumerable experiments with two voices, two inftruments, 

 two founds on one inftrument, as double ftops on a viohn, 

 violoncello, and on an organ, that the third found thus pro- 

 duced in the medium was the true fundamental bafe, fuch as 

 Tartini himfelf has expreffed by mufical notes. 



D'Alembert and all the French writers on the fubjeijt, 

 have ftated the cafe (except Rouffeau) in a difingenuous 

 manner. Even when difputing Rameau's principles, they 

 wifh to keep him above Tartini and all foreign claimants to 

 original difcovery or improvement in mufic. Rouffeau is 

 envied for being the firft to abufe the old French mufic, even 

 by thole who thought and allowed it to be bad in their other 

 writings. See the Abbe Arnauld and M. Suard's critique 

 upon his Di£tionnaire de la Mufique, with thofe of the Abb^ 

 Rouffier, M. Laborde, &c. &c. 



Terzo, in Geography, a town of France, in the de- 

 partment of the Tanaro ; 2 miles S.W. of Acqui. 



TERZOLA, in Botany, a name by which fome authors 

 have called the eupatorium cannabinum, or water hemp- 

 agrimony. 



TERZOWITZ, in Geography, a town of Bohemia, in 

 she circlf of Rakonitz ; 7 mjics S.S.E. of Rakonitz. 



Tartini has added the above, and even given us a 3d found to difcords. 



TESA, in Ancient Geography, a town of Afia, in Car- 

 mania, upon the gulf Paragon. Ptolemy. > 



TESAKON, in Geography, a town of Africa, in the 

 country of Nalus, on the Nuno Triftao. 



TESCAPHE, in Ancient Geography, a town of Afia, in 

 Mefopotamia, on the banks of t^he Tigris, near Seleucia. 

 Ptol. 



TESCHAR, in Geography, a town of Hindooftan, in 

 Lahore ; 42 miles E.S.E. of Bullaufpour. 



TESCHEN, a principality of Silefia, bounded on the 

 N. by the principaUty of Ratibor, on the E. by Poland, 

 on the S. by Hungary, and on the W. by Moravia. It is 

 for the moft part hilly, the Moravian chain terminating near 

 Jablunkau, in the fouthern part, where alfo begin the Car- 

 pathian mountains. On the other hand, the north part is 

 very fwampy, and overrun with lakes and meres ; notwith- 

 ftanding which, there are feveral fertile fpots. Befides 

 which, it abounds likewife in wood. In the whole princi- 

 pality are five towns, part of the inhabitants of which fpeak 

 German, and the others Polifti. The mountains are inha- 

 bited by Walachians, who make good heyducks, or foot- 

 foldiers. The excellent fire-arms here, called Tefchins, re- 

 ceive their name from this country, and more particularly 

 from its capital, where they ai"-c made in great quantities. 



Teschen, or Teiffin, a town of Silefia, which gives 

 name to a principality, fituated on the Elfa, partly in a 

 valley, and partly on a hill, and furrounded by a inorafs. 

 It contains a Roman Catholic and a Lutheran church, a col- 

 lege, and four convents. The inhabitants carry on fome 

 commerce in leather, wool, and wine : here is a manufac- 

 ture of fire-arms, and a particular kind of fnfil, called, from 

 the town, Tefchins ; 26 miles S.E. of Ratibor. N. lat. 

 49^43'. E. long. 18° 41'. 



TESCHENAU, or Teschna, a town of Bohemia, in 

 the circle of Bechin ; 8 miles E. of Sobieflaw. 



TESCHONOVITZ, a town of Pruffia, in Oberland ; 

 18 miles E.S.E. of Ortelfberg. 



TESCUCO. See Tezcuco. 



TESCYLETIUM, in Ancient Geography, a town of 

 Italy, on the coaft of Magna Graecia, between the temple 



of 



