8 ROYAL SOCIETY OF CANADA 
beam up to 2,400-lbs., but beyond this load there is a perceptible 
movement towards the compression side. 
(3) The diagram for the beam under loads 10-ins. from the centre 
shows a slight movement of the neutral surface towards the tension 
side for the smaller loads, but under 3,600 lbs. it suddenly moves to 
the compression side, and then gradually returns towards the centre 
under still higher loads. 
(4) Loads at 20-ins. from the centre show that the neutral sur- 
face is much nearer the tension side for the smaller loads, but gradually 
moves to a position slightly on the compression side for the higher 
loads. 
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