The elements of musick display'd; or, Its grammar, or ground-work made easy: rudimental, practical, philosophical, historical, and technical .. . d forwards, afcertain-ing the Number of Beats ax any determinate Length, and theexact Quantity of Time that is fpent in that Motion ; fromwhich, thofe excellent Machines called Clocks and Clock-Work are made and regulated ; for it is found by Experi-ence, that a Pendulum, whofe Length from the Point ofSufpenfion to the-Center of the Ball, is 39 Inches and 2Tenths of an Inch, Vibrates or Beats Seconds, or 60 Timesin one Minute; and for the Certainty a
The elements of musick display'd; or, Its grammar, or ground-work made easy: rudimental, practical, philosophical, historical, and technical .. . d forwards, afcertain-ing the Number of Beats ax any determinate Length, and theexact Quantity of Time that is fpent in that Motion ; fromwhich, thofe excellent Machines called Clocks and Clock-Work are made and regulated ; for it is found by Experi-ence, that a Pendulum, whofe Length from the Point ofSufpenfion to the-Center of the Ball, is 39 Inches and 2Tenths of an Inch, Vibrates or Beats Seconds, or 60 Timesin one Minute; and for the Certainty and Excellencythereof, it is called The Royal Standard : For it is demon-ftrated, that all Lengths of Pendulums are to one another,as the Squares of the Times of the feveral Ofcillations, & am told by Des Cartes, Kercher, Morely, Bacon, Digby,Malcolm, Holder, Sir Ifaac Newton, Mr. Derham, Martin,and feveral others, too tedious here to mention, that Pen->dulums, were fir ft obferved, and brought in Ufe by the in»genious Galileo ; and in this Form: E $ Point 58 The Elements of MUSIC K made Eafy, &c. Print of C-JSSKS. EXPLANATION. Firft, Take a Wire or String, of any Length you plcafe,Jtnd fallen a Weight or Plummet at one End; then mafce UHole or Noofe at the other End, and hang it on a Nail,Point or Center; and it will hang perpendicular, as from Ato B.—Then draw up the Ball or Plummet (fo high fromthe Center of Gravity, as the Length between the Paint ofSufpenfion, and the Center of the Ball) towards the Point ofthe Semicircle C, and let it fall, and it will ofcillate or fwingtowards D ; and then come back again towards C, andmove both Courfe and Recourfe, i. e. forwards and back-wards till it refts perpendicular at the Center of Reft or Grs*pity, B : Its Point of Sufpenfwn being A. Here you are to obferve, that, thd the plummet rangesa greater Compafs between C and D, than it does betweenE andF, yet it always moves in Equal Spaces of Time, bothforwards and
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