H U Y 



.385 



H U Y 



j isoehronism produced by making 

 pendulum! swing between cycloidal cheeks; h 

 cavrry of the ring and satellites of Saturn ; his applu .1- 

 tion of the spiral spring to rcgulatf die hjances of 

 watches, (in which however be was anticif.au.-d by Dr 

 Uooke ;) hi* discovery ot* the law of collision, which 

 he shares with Dr U'Lllis and Sir Christopher U 

 hi* theory of the centre of oscilUtion ; hi* investigations 

 central force*; and the beautiful law, by 

 which be ha* represented the pnenomena of double re- 

 fraetioa, exhibit the depth and variety of bis attain- 

 ments, f* entitle him to a very high rank among 

 Mtriuai men who have done honour to their 



I In oar articles ASTRONOMY. U M , HOROLOGY, 

 NIC*, and OKTIC ., the reader will fiud an ample 

 account of his various labour*. 



HUYGEX's TEMPERAMENT of the musical scale. 

 In llis-i, M.Christian Huyjrena published his Cyclut 

 Ifiir:'ioaicus, or commensurate system, of 31 equal di- 

 visions in the octave ; of which his mean tone is :>, and 

 major limina 3, of these divisions. The temperaments 

 calculated by Mr Farey's 12th scholium, in the Phi' 

 loiofjucal Magazine, vol. xxxvi. p. 5'J. are as fol- 

 lows, viz. V 2.651 TfcV.i;, III+O.UKXSl^i:, and VI 

 In p. 224. of the second edition of Dr 

 Smith's IliirntoHifs, he gives the monochord lengths of 

 strings for each of the notes of this system ; and at 

 r. he mentions a method by which the beats of 

 its concords may nearly be obtained: but this being 

 neither sufficiently easy of application, or exact enough, 

 we have calculated them anew, as follows, viz. 



In mlunm 1. the value* of the note* are given, a* 

 they arise in cakwsMing by the series of tempered iftke, 

 a* above, it* wolf fifth f O , E beiag V+ l7.IOI5flSz. 

 Col. S. is, a* Mual, *rtaatiirl t* the octave atisve the te 

 norcliif C. All the beatings in column* 5. to f). are 

 jAorp or /ftrt, a* marlied at the bottom of each 



t the 4th end Vth wotm, which arc contrary to 



all the other* of these coaeord*. 



Mr Ambrose Warren, in a thin quarto work, edad 

 The Tonometer, pobluhed in ]::., gave the lengths 

 without any intimation of iu 



by M. Hnygens. (.) 

 uNTiiro, vol. si. p. 370. and < 

 article MAMMALIA. 



r. e onomeer, poue n 



e the te- of rtrinirs for Uiis sy*tem. wit 



o fl. are having bem before puWiibed 



nrfnasi, liVINV See HuNTiiro, 



our 



HYBERNATION OF ANIMALS. 



kVfbtnta- T 1 

 ,t 1 KK tliei>ij whteh take place in the condition of 



Am:.. ! the appuiach of wmter fl*aiiiar to ail of 



> ""~/- 1 ^ u ' coarse of a few week* hi autumn, I 



exchange their lre* of *ua*mer green fur the I 



vrllow, while) 



fm^f, the vftil principle redrea to the roots, or is in 

 crmderaed in the buda. In this state of 



of winter a ttate which i 



A* thb de|Mrtnwnt of vrgitial* phrnoiogy ha been 



iietratni in the article BOTANV, awl may be 



fully exp'iined in the elementary works on that 



science, we refrain from Csrther dMooMmi OB the 



flawject. 



VOL. XI. TA1T If. 



t!,r 



of winter. The swallow forsake* 

 star, the landrail retire* from the 

 deeart* the hedge*. The nightin- 

 to pour forth her evening song, ati<l in the 

 grove all the warblers are silent. The lost or broken 

 Jaawliiis of bird* are renewed, to complete their cover, 

 ing. and to enable thorn, if aecmary, ta retire to warm- 



1 other animal*, obtain an 

 I supply of 'clothing, collect a stock of provi- 

 sions, or peacefully fall into a te*aoiari lethargy. In 

 theee saisuye conditions, animal* prepare to pas* the 

 winter, or are said to hibernate. 



This Msbject i* still involved in much obscurity. It 

 t ue, atbemg bwt Mneteljr 



