Archive image from page 288 of The cyclopaedia; or, Universal dictionary. The cyclopaedia; or, Universal dictionary of arts, sciences, and literature cyclopaediaoruni09rees Year: 1819 CON CERT-PITCH. that on which the tenor-cliff i- placed, being alfo the ledger line above the bafe daff jj treble ftaff of mufic ft- , or the fame below the is now generally made the key-note, in ft . tes of the o£lave, whether diatonic or tempere ', we .'â â i 1 adopt each of the formulas, to the rinding of the pulfes made by this note in ten fecon's of time, to be determined bv a (lop-watch, a fecond pend
Archive image from page 288 of The cyclopaedia; or, Universal dictionary. The cyclopaedia; or, Universal dictionary of arts, sciences, and literature cyclopaediaoruni09rees Year: 1819 CON CERT-PITCH. that on which the tenor-cliff i- placed, being alfo the ledger line above the bafe daff jj treble ftaff of mufic ft- , or the fame below the is now generally made the key-note, in ft . tes of the o£lave, whether diatonic or tempere ', we .'â â i 1 adopt each of the formulas, to the rinding of the pulfes made by this note in ten fecon's of time, to be determined bv a (lop-watch, a fecond pendulum clock, or a fimple pend'.ilum, ufed for the exprefs pu pule of determining periods of 10' each. (See Pendulum.) method was fuggefted by Pere Merfenne. It confifts in a wire or cat ;ut ftrin -, of about 15 to 17 feet in length, owr two fixed bridges at its extremities ; and after this, dividing the diftance between the bridges accurately into eight equal parts ; then fixing another bridge at one of thofe divifions from the end ; taking care that the new bridge, which (hould have a tolerably fharp edge or top, does not drain the firing, or force it out of itsitraight line. The tuning-fork, pipe, or firing C, upon the inftrument whofe pitch is to be determined, is now to be compared with the found of the fth part of the firing ; and if its double octave below nearly agrees therewith, the tenfion of the whole ftrin.; is to be altered, as in tuning a ftringed indiument, either tightening or flackening it, until the jth part is in exact uuifon with the double octave below the note C, without any beats or undulations : if the found of the |th of the firing fhould be found on trial to give a clear mufical note, and yet differ very materially from the double octave below C, it may be neceffary to affurne a greater or leffer length between the extreme bridges, and to determine anew the place of the bridge for the fth part thereof: and after the jth part has been nicely
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