254 On the Measure of 
sistently. do otherwise than estimate the abso- 
lute forces of A and B by the respective 
changes of figure produced by each. 
I shall now conclude my observations ‘with 
a simple application of the principle which I 
have endeavoured to support, to the resolution 
of compound moving forces. 
If we suppose BAC (fig. 22) to be aright 
angle, and three strings, AB, AC, and AF, 
in the same plane, to be united at A; the 
strings AB and AC to be prolonged to a 
length indefinitely great, when compared with 
the diagram, and the end of each of the 
three strings to pass over a vertical pulley. 
If the parallelogram be completed, and if 
three weights m, n, and 0, which are to each 
other as AD, AB, and AC respectively, be 
suspended by the respective strings AE, AB, 
and AC, they will balance each other, and the 
strings will coincide in direction with the dia- 
gonal and sides of the parallelogram. If the 
weights be set in motion, by taking from m an 
indefinitely small part of its weight, n and o will 
descend, raising m, and the point of junction 
of the strings will move in the direction AD. 
When that point has arrived at D, the weight 
m will have ascended -a space equal to AD, n 
will have descended a space equal to AB, and 
o will have descended a_ space equal to AC. 
