282

NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE

solve the triangle ADB, just as if AB were a beam as in the previous
examples, but we must first find the length of AB.

Draw fig. 26, AYBX to represent the square tray and note that

3=V32==5-66 and AC=2'S3 feet.
Y________4' * B

Fig. 26.
We can now construct triangle AOD to scale as in fig. 27 by making
O4=2'83 feet, CD perpendicular to AC, and AD=7 feet. Then con-
struct the triangle of forces DCfl, making DG=ZQ cwt., and GFparallel
to DH. The length of DF as measured from the scale of weights
gives the tension on each of the two legs DA and DB, via.,* 10*9 cwts,,
assuming that they alone were supporting the load; but the other two