Qentury II. 



4« 



maketh the Sound a little flatter ,but no other apparent Alteration. TheCaufe 

 is manifeft ; Partly for that it hindereth the Iflue of the Sound; And partly 

 for that it maketh the Air,being blown together,lels moveable. 



THe Loudnef and Softnefs of Sounds, is a Thing diftindt from the Mag- 

 nitude and Exility oi Sounds - 7 For a Bafe String, though foftly ftrucken, 

 giveth the greater Sound 5 But 'dTrebble String ,if hard ftrucken, will be heard 

 much further off. And the Caufe is^for that the Bafe String ftriketh more 

 Air •, and the T rcbble lefs Air,but with* a lharper Percuflion. 



It is therefore the Strength of the Percufjion, that is a Principall Caufe of 

 the Loudness or S of toe fs of Sounds : As in knocking harder or fofter $ Wind- 

 ing of a Horn ftronger or weaker ; Ringing of a Hand-bell harder or fof- 

 ter,&c. And the Strength of this Percuffian, confifteth,as much,or more in 

 the Hardnefs of the Body PercuffedjLS in the Force of the Body Per cubing .-For 

 if you ftrike againft a Cloth, it will give a lefs Sound-, If againft Wood, a 

 greater 5 If againft a Metall,yet a greater •, And in Metals,if you ftrike againft 

 Gold . (which is the more pliant,) it giveth the flatter Sound ; If againft Sil- 

 ver or Brafs, the more Ringing Sound. As for Air, where it is ftrongly 

 pent,it matcheth a Hard Body. And therefore we fee in difchargin^ of a Peece, 

 what a great Noife it maketh. We fee alfo, that the Charge with Bullet 5 

 Or with Paper wet, and hard flopped Or with Powder alone, rammed in 

 hard maketh no great difference in the Loudnefs of the Report. 



The Sharpnefs or Jjhicknejs of thep ercuflionjsz great Caufe of the Loud- 

 nefs, as well as the Strength : As in a Whip or Wand, if you ftrike the Air 

 WLthit^ the Sharper and Quicker you ftrike it, the Louder Soundh giveth. 

 And in playing upon the Lute, or Virginalls, the quick Stroke or Touch, is 

 a great life to the Sound. The Cauje is, for that the Quick Striking cutteth 

 the Air fpeedily whereas the Soft Striking doth rather beat, than cut. 



^^Communication o(Sounds(&s in Bellies of Iwf«,En?ptv Vef- 

 fcls, fefcfr hath been touched obiter, in the Majoration of Sounds : 

 But it i s fit al.o to make a Titled it apart. 



The Experiment for greateft Demonftration of Communication of Sounds, 

 is the chiming of Bells h where if you ftrike with a Hammer upon the Upper 

 Part, and then upon the Midft, and then upon the Lower, you (hill find the 

 Sound to be more Trebble, and more Bafe, according unto the Concave,on 

 the Infide : though the Percuffion be only on the Outfide. 



When the Sound is created between the Blafi of the Mouthy and the Air 

 of the Pipe , it hath neverthelefs fome Communication with the Matter of the 

 Sides of the Pipe, and the Spirits in them contained $ for in a Pipe, or T rum-. 

 /x^of Wood, and Brafs, the i'^Wwillbe diverfe-, So if the Pipe be cove- 

 red with cloth, or Silk, it will give a diverfe Sound, from that it would do 

 of it felf • So,if the Pipe be a little voet on the Infide, it will make a differing 

 Sound, from the fame Pipe dry. 



That Sound made within Water, doth communicate better with a hard 

 Body thorow Water, than made in Air, it doth with Air 3 Vide Experimen- 

 tum, 134. 



We have fpoken before (in the faquifition touching M«- 

 fitK) of Muficall Sounds 9 whercunto there may be a Concord or 



E 3 Difcord 



