A MUSICAL KEY. 
or else we must forever remain in ignorance of theit 
individual character. Wemay value a half or a quarter 
note according to our discretion, but once having de- 
cided upon that value we must sustain it. 
If one does not possess that interesting and simple 
little instrument called Maelzel’s Metronome, the follow- 
ing instructions will serve in the construction of an 
excellent substitute. Attach asmall weight to the end 
of a common tape measure with half, quarter, and 
eighth inches marked thereon; a penknife suspended 
crosswise (not lengthwise) will do. The following table 
will then show the equation of inches and metronome 
beats ; the last are indicated by the number per minute: 
60 = 39} inches 112 = 113 inches 
G6) Slee St 116 = 101.“ 
fee be 1 120 = 79h .- = 
30 = 21a." 126 = St ast 
Sor 1ST ae. 132 Sie. Ss 
92. = 162 ° * eae eae 
96 = 1 bey ec 144= 63 * 
£00 == 145. 3s 192 = v6 is 
£04 — 188 6 160 = foe 
108 = 123 <“ 166 =) 42 = 
