Dearborn’s gold standard Balance. 47 
be inexplicable, as experience demonstrates that a beam, turning very 
easily, and accurately adjusted, will in time lose its balance. The 
index, which is an iron rod about eighteen inches long, and made 
truly cylindrical, is screwed into the lower edge of the beam, and 
well braced. Just below the extremity or point of the index, a Pale 
let moves upon an axis, in such a manner, that when one end is 
pressed down, the other rises against the end of the index, and stops 
its vibrations. On this pallet a centre-line is marked, for determin- 
ing the exact level of the beam ; and when the parts are thus far 
completed, the centre of ‘grav ity must be Cao above the 
+ 
termed a tc 
“wee posrmaeee 2 
eep it at any pow’ raiened ; 
the ecm of the 1 motor may he such as the fancy suggests, but its 
weight must be just sufficient to depress the centre of gravity a little 
below the centre of motion, when placed near the lower end of the 
index. Its proper place may be known by first raising it so high 
that the beam will not vibrate, then move it lower by SE TN until 
the beam vibrates with a slow motion. | In this ng 
erie oe hick, that is 60 aay Ge atin oF the other will _prepon- 
annie maitedsinghridch:tedbpeni scmne.aunce tanep) thé:serbadenanetpamag: 
ful; on turning the other end of the beam, the needle was repelled with e 
force. This power has probably Sr ntaenes ops the hon rig bic we 
used in large scales. 
os * * The term Motor signifies “amore” ter all Hecane he i 
plemen » to which it is applied, moves the centre of gravity, and hereb Ps to 
the beam its state of great sensibility or p iedipuisis nition. a alee 
