Dearborn’s gold standard Balance. 41 
accident might direct. The preceding remarks principally concern 
the ight beam; I shall next speak of the loaded beam. 
The strength of a beam must be proportioned to the quantity it is 
designed to draw; and if strong it must be heavy, and if heavy it 
must turn with difficulty, on the construction above described, if no 
measure be adopted as a corrective; and the only corrective I have 
known applied, is a much greater evil to correct the smaller ; this I 
shall endeavor to explain. Some workmen, finding the difficulty 
attending the turning of a beam was nearly in proportion to the 
weight of the beam, hs cs 28 weed, bone of suspension consider- 
re of motion by the beam is made to turn 
with e€ en loaded aire ‘weight, but loaded beyond this 
cquidtity 3 it Foeedmnes what is vulgarly termed a dead beam; that is, 
one scale or the other will preponderate and remain down; while the 
same beam, if lightly loaded, will turn with difficulty. In either of 
which extremes accuracy is not to be expected, the beam being fit 
= ee, oy a meine quantity, a whch it will 
_ Demonstration of the cause, which produces the effec 
fee 8 ar : 2. 1 sie ; 
dues ante points of suspension, FOO GE Wadeteen os tee 
treme, to make the explanation more intelligible.) It is evident that 
the points of suspension vibrate in arcs of the circle adg ec, of 
which 4 is the centre ; that while the beam is level, the points d and 
e are at equal horizontal distances from the centre, and that those 
distances are equal to the co-sine of the angle ¢ 6 ¢ or the line 5/5 
depress the point e to ¢, and the point d is raised to g ; the al 
a ne radius, and th t of the 
