LIFT BRIDGE OVER THE MURRAY AT SWAN IILL. (as 
being only a difference of £210 in the prices quoted, the offer for 
manufacture in Melbourne was accepted. 
Mr. Allan agreed with Mr. Dare as to the practical difficulties 
to be anticipated in working by hand power, a bascule where the 
local features necessitated the tail end being lowered through the 
flood waters. 
Referring to Professor Warren’s remarks re the machinery, 
Mr. Allan said that as the counterweight equalled the weight of 
the lift span, the only weight to be raised was that due to the 
unbalanced weight of the ropes, 430 Ibs., and the frictional resis- 
tance in the journals of the four rope wheels added to the resistance 
due to the bending of the ropes calculated by Mr. Allan at 1370\bs. 
making a total pull of 1800 Ibs. necessary to impart motion when 
either lift span or counterweight was on the rests, provision was 
therefore made in the winch for raising 1800 Ibs. Making allow- 
ance for the loss due to friction in the winch itself by taking the 
effective power of one man as 18lbs. applied at the winch handle, 
the ratio required was thirty-three revolutions of winch handle to 
one of pinion, the gearing actually provided being thirty-four to 
one, 
