In order to show concisely the results of such a demonstration let it be desired to find the position of a moving load which will give the greatest stress to any web member, as _S_ in Fig. 24. Let the point of intersection of _GK_ and _DC_ be found in the point _O_, then let _CK_ be extended, and on its extension let the perpendicular _h_ be dropped from _O_. The distance of the point _O_ from _A_, the end of the span, is _i_, while _m_ is the distance _AD_. Using the same notation which has been employed in the discussion of beams, together with that shown in Fig. 24, equation (33) expresses the condition to be fulfilled by the train-loads in order that _S_ shall have its greatest stress. The first parenthesis in the second member of that equation represents the load between the panel _p_ and the left end of the span, while the second parenthesis represents the load in panel _p_ itself. _l_ _W₁ + W₂ + ... + Wₙ_ = - ----(_W₁ + W₂_ + etc.) _i_ _l_(_m + i_) + (_W₃ + W₄_ + etc.) --------------- (33) _pi_. It will be noticed in equation (33) that the quantity _m_ shows in what panel the inclined web member whose greatest stress is desired is located, and it is important to observe that panel carefully. If, for instance, the vertical member _KD_ were in question, the point _O_ would be located at the intersection of the panel _NK_ and the lower chord of the bridge. In other words, the point _O_ must be at the intersection of the two chord members belonging to the same panel in which the web member is located. =98. Application of Criterions for both Chord and Web Stresses.=—The criterion, equation (33), belongs to web members only. If it is desired to find the position of moving load which will give the greatest chord stresses in any panel, equation (27), already established for beams, is to be used precisely as it stands, the quantity _l′_ representing the distance from one end of the span to the panel-point about which moments are taken. If the desired positions of the moving load for greatest stresses have been found by equations (27) and (33), those stresses themselves are readily found by taking moments about panel-points for chord members and about the intersection-points _O_, Fig. 24, for web members. These operations are simple in character and are performed with great facility. Tabulations and diagrams are made for given systems of loading by which these computations are much shortened and which enable the numerical work of any special case to be performed quickly and with little liability to error. These tabulations and diagrams and other shortening processes may be found set forth in detail in many publications and works on bridge structures. They constitute a part of the office outfit of civil engineers engaged in structural work.