Page:Cyclopaedia, Chambers - Volume 2.djvu/719

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"Englift, we may fay Sefqiii-atterat % Sefqi-third, SefquU fourth, &c.

As to the Kinds of Triples exprefled by the Particle Sefqui, they are thefe : The Greater <Perfeil Sefqui-alte- ral, which is a Triple, where the Breve is three Mea- sures, or Minims, and that without having any Point. The Greater Imferfecl Sefqui-alteral, which is where the Breve, when pointed, contains three Meafures, and with- out any Poinr, two. The Lefs c Perfe6i Sefqui-alteral, which is where the Semi-breve contains three Meafures, and that without any Point. The Lefs Imperfect Sefqiii- alteral, a Triple, mark'd G * where the Semi-breve, with a Point, contains three Meafures, and two without. According to Scntempi, one may Iikewife call the Triples I and y } Sefqui-alteral.

The Sefqui-oBave, is a Kind of Triple, mark'd C |, called by the Italians Nonupla di Crome, where there are 9 Quavers in every Meaiiire or Bar, in Lieu of 8- The <Dou'de Sefqui-quarta is a Kind of Triple mark'd C | 9 called by the Italians Nonupladi Semi-minime, where there are 9 Crotchets in each Meafure, inftead of 4.

SusQvi-alteral, in Geometry, and Arithmetic, is a Ratio between two Lines, two Numbers, $$G, where one of them contains the other once, with the Addition of an Half. Thus 6 and 9 are in a Sefqui-alteral Ratio, fince 9 contains 6 once, and 3, which is Half of 6, over : And 20 and 30 are in the fame ; as 9 contains 20, and half of 20 or 10. See Ratio.

Szsqvi-duplicate Ratio, is, when of two Terms, the greater contains the lefs twice, with half another over : As 15 and 6 5 50 and 20. See Ratio.

S-£.sqvi-alteral r Sssoyi-cffave, Ss.sqv i-quartan, Szsqv i-tertian,

In Mufic ' See :

Sesqui.

SESQUIDLTONUS, in Mufic, a Concord refulting from the Sounds of two Strings, whofe Vibrations, in equal Times, are to each other in the Ratio of 5 to 6. See Ditontjs.

SESQUIQUADRATE, is an Aftec!, or Pofition, of the Planets, when at the Diftance of four Signs and an Half 5 or 135 Degrees from each other.

SESQU1QU1NTILE, is an Afpeft of the Planets, when 108 Degrees diftant from each other.

SESSION, in the Schools, each Sitting, or Affembly, of a Council. In quoting Councils, we Jay, In fuch a Sejfc-n, fiich a Canon, £-?c. Seffion of Parliament ; is the Seafon, or Space, from its Meeting to its Prorogation, or Diifolution. See Prorogation.

Sessions, a Sitting of Juftices in Court, upon Com- miffionsj as the Seffions of 'Oyer and Terminer ; £Hiarter~ Sejfions, called General Seffions, or Open Seffions, oppofite whereto ave Efpecial, otherwife called l Privy-S:Jfions, which are procured upon ibme fpecial Occafion, for the more fpeedy Diipatch of Juftice. See Quarter-Sessions. 'Petit Sejfions, or Statute Sejfions, are kept by the High- Conftable of every Hundred, for the placing of Ser- Tants.

SESTERCE, Sejlertius, a Silver Coin, in Ufe among the Ancient Romans, called alio Uhimmus, and lbmetimes 'Nummus Sejlertius. The Sejlerce was the Fourth Part of the ^Denarius, and contained Two As's, and an Half; eftiinated in Englijb Money, at One Penny Half-penny Farthing. The Sejlerce was at firft mark'd with L L S, the two L's fignifying two Libra; and the S Half. But the Librarii, afterwards, converting the two L's into an H, exprefled the Sejlerce by H S. The Word Sejiertim was ufed by way of Abbreviation for Semifertms, which fignifies Two, and a Half of a Third; or, literally, only Half a Third : For in expreffing Half of a Third, 'twas underftood, that there were Two before. Some Authors make two Kinds of Sejlerces ; the Lefs, called Seflertms, in the Mafculine Gender ; and the Great one, called Sejlertium an the Neuter. The Firft, that we have already defcribed : The Latter containing a Thoufand of the other, or -j I. 16 s. % d. of our Money. Others will have any fuch Diftinction of great and little Seferces, unknown to the Romans. Sejiertim, fay they, was an Adjeftive, and fignified As Sejlertius or two ^"'s and a Half: And when ufed plurally, as in giiadraginta Sejlertium, or Seftertia, 'twas only by Way of" Abbreviation, and there was always underftood Millia, Thoufands : This laft is the more probable Opinion. To be qualified for a Roman Knight, an Eftate of Four Hundred Thoufand Seferces was required ; and, for a Senator, Eight Hundred Thoufand. Authors mention a Copper Sejlerce, worth about | of a Penny Englijh.

Sesterce, Sefierthis, was alfo ufed in Antiquity, for a Thing containing Two Wholes and a Half of a Thing: As Ms was taken for any Whole, or Integer. See A S.

SESTUFLE SEXTUPLE, in Mufic, a Kind of mix'd Triple-time. M. SroJJart thinks, 'tis improperly thus called, and ought rather to be called Sinary-'Jr/pfa. We only find three Kinds of it in Authors ; but one may add two others 5 the Firft, the Seftuple of the Semi- breve, or Triple, of 6 for 1, or Six-one. The Second the Seftuple of Minims, or Triple of 6 for 2, or Six- two. The Third, the Triple of Semi-minim, or Triple of 6 for 4, or Six-four. The Fourth, the Sextuple of the Croma, or Triple of 6 for 8, or Six-eight. The Fifth, "the Sextuple of Semi-croma, or Triple of 6 for 16, or Six-fixteen. See Triple. t SETHIANS, or SETHINIANS, a Branch of the An. tient Gnofticks ; thus called, becaufe of their pretending to fetch their Origin from Seth, the Son ot Adam, whom they called Jefm, and Chrift ; from an Opinion, that Seth and Jefus were the fame Perion, who came down from Heaven two ieveral Times. As they had the fame Philoibphy with the other Gnofticks, they had numerous other Fables in their Syftem. See Gnosticks. They pretended to have feveral Books of the Antient Patri- archs ; particularly, Seven of their great Mafter Seth, and one of Abraham, full of manifeft Falfities 5 which yet they call Apocalypfe, or Revelation. The Book called the Little Genefis, anciently very common in the Churches of the Eaft, was borrow'd from them. From this Book they learn'd the Name of Seth's Wife, who, they fay, was called Hor<ea. Some imagine, they borrowed a great many of their Fictions from the Hellemfi yews.

SETON, Setaceum, in Chirurgery, $$c. a Kind of topi- cal Remedy, ufed, like a Cautery, or an Iflfue, to divert Defluxions from the Eyes 5 by making a Wound in the Skin of the Hind Part of the Neck, which is kept fup- purating, by Means of a little Skain of Silk, or Cotton, pafied through it. *Tis alfo applied to fuch as are apt to fall into Epileptic Fits: 'lis of more Efficacy than a common Iflue, but is prefcribed with much the fame Intention. See IsstJE.The Operation is frequently pra&ifed on Horfes, &c. and called, by the Farriers, Ro-welling ; See Rowel. Setons evacuate with a gentle Pain ; fhakc the nervous Kind 5 evacuate Serum, and give Vent to Repletions,

SETTER, among Farmers. To Setter, is to cut the Dew-Lap of an Ox or Cow, and into the Wound to put Hellebor after, whereby an Iflue is made, for all Humours to vent themfelves. See Issue, and Seton.

SETTING, in Aftronomy, the OccuUation of a Star or Planet; or its finking below the Horizon. Aftronomers make three different Kinds of Setting of the Stars : Cofmical, Acronical, and Heliacal. The Firft, when the Star fets with the Sun: See Cosmical. The Second, when it fets at the Time the Sun rifes : See Acronical. The Third, when it is immerged, and hid, in the Sun's Rays : See Heliacal.

To find the Times of the Setting of thjs Sun and Stars; See Globe.

Setting, in Sea Language. To fet the Ship by the Compafs, is to obferve how the Land bears on any Point ot the Compafs ; or, on what Point of the Compafs the Sun is : Alfo, when two Ships fail in Sight of one another, to mark on what Point the Chafed bears, is termed, Set- ting the Chafe by the Compafs,

SEVENTH, in Mufic, an Interval, called by the Greeks Heptachordon ; whereof there are four Kinds : The Firft, The defective Seventh, confiding of three Tones, and 3 greater Semi-tones. The Second, called by Ztir- lin, and the Italians, Semi-ditano condiapente, or Settmo Minore; is compofed Diatooically of feven Degrees, and fix Intervals, four whereof are Tones, and the reft greater Semi-tones, as from de to ztt; and Cromatically of ten Semi-tones, fix whereof are greater, and four lefs : It takes its Form from the Ratio £Htadripartiens ^uintss, as 9 to 5. The Third, called by the Italians, II Ditoxo eon Diapentes, or Settimo Maggiore, is compofed Diato- nically, like the former, of feven Degrees, and fix Inter- vals, fix whereof are full Tones, and a fingle one a greater Semi-tone ; fo that only one major Semi-tone is wanting, of the Ocfave : As from tit to /;, and Cromatically ot twelve Semi-tones, fix whereof are greater, and five lefler. It takes its Form, or Origin, from the Ratio of 1$ *°. 8. The Fourth, is the redundant Seventh, compojea ^ five Tones, a greater Semi-tone, and a leffer ; as from fi " to la: So that it only wants a Comma of an G5U ve .5 that is, ib much as it wants to render its fecond S^* 111 " tone greater. Hence many confound it with the Oifa ps itfelf j maintaining, with good Reaibn, That only the three firft Sevenths can be of any Ufe.

SEVERAL-TAIL, in Law, is that whereby Land 11 given, and Entailed feverally to two. E. gr. Land '* given to two Men and their Wives, and the Heirs ° their Bodies begotten. The Donees, here, have J<j int Eftate for their two Lives yet they have feveral l nhe *