622 
(La, Ut, dt, di, le hy, lv , ivi, le) *) have been drawn, along which the 
“forces” are acting, which would play a part in the construction 
of the elastic link-polygon, if the beam lay on fixed points of 
support. 
LTDN LION 
= I == | = 
AMI | \\ TET | WNUK aH 
L L Js 
| | | | | 
| 
an | a En: | 
en | 
a ee 
E) ae Ik 
| ays 
eae tn Aa 
8 ' : 
(ewer ee ee ae 
| | Ee Er 7 ie | 
i A, == Nee i! Pe | we 
| ay pes Oo : = 
| ek Tt | 
= DE | Aw 
Ee erp | 
eee ina 5 | 
a 2 le Aa | } 
| 
q 
Fig. 1. 
If now the descents AA, BB and CC of the points of support 
A, B, C were known, it would be possible to construct the elastic 
link-polygon of the beam, because together with the point A 
also the point A’ is fixed, which lies a known distance a under A 
and is the starting point of the construction of Monr *). 
The situation of A, hence also that of A’, in reality being unknown, 
we shall for the present try to find a solution of the problem by 
assigning to the moment of transition Mga certain value, say z 
metre-ton. For in this way the reaction and therefore also the descents 
1) By la, lB, lc the verticals passing through the points A, B, C are indicated; 
by Ur, Uy ete. the vertical lines on which the angles lie of the elastic link-polygons 
that will be drawn later on. 
?) In the figure this point A’ is by mistake indicated by A’. 
