These things made early clavichords unable to play certain notes simultaneously. Johann Georg Stauffer prominently used these things on an instrument featured in a piece whose first theme begins “A, B, short C, A” and then ascends scalewise to E. Thomas Mace advocated using “double” forms of these things on one instrument, while on later instruments, they are subject to the “rule of 18.” The orpharion debuted a style of these things that are angled on (*) multiscale instruments, or (10[1])“fanned.” (10[1])These things are a defining feature of the solo instrument in an A (10[1])minor sonata that Otto Deutsch cataloged as its composer’s D.821. Small ones of these things, which may be “dressed” to stop buzzing, are called tastinos. They’re not strings, but gut (10[1])was used to make moveable ones of these things (-5[1])that were tied onto arpeggiones and viols. For 10 points, what features standardize intonation on some string instruments’ fingerboards? ■END■ (10[4]0[1])