61 
cmtrivecl hy the late Mr Watt. 
y'and 15 inches interior diameter. Part of tltp joints are foipmed 
in the usual way, but others ^re something like what is called 
“ ball and socket,” or universal joints.” The whole is laid on 
strong frames made of parallel logs ; these frames are joined 
by strong iron hinges, having their pivots in horizontal lines at 
right angles to the axes of the pipes, and passing through the 
centres of spheres, of which the zones of the sockets are por- 
tions. The flexible joints are at the extremities of the frames. 
This will be easily understood from the figures in Plate IV. 
The frames and pipes were put together in succession on the 
south side of the river, and (the open or north end being plugr 
ged,) were hauled into and across the bed, in a trench prepared 
for them. The machinery for hauling them was of course on 
the north side ; the operation was aided and directed by pod- 
tobns, &c. The moveable joints of the pipes, and hinges of 
the frames, allowed them to assume the form of the bed. 
Upon the plugged end emerging from the water on the north 
side, it was immediately opened and connected with the main 
leading to the pumps, to secure it against accidents from floods. 
There is a pontrivance for removing any sand which mav accu- 
mulate in the pipe. That part which is under water is covered 
over with stones and gravel, to protect it from injury from pas- 
sing vessels. 
" Plate III. Fig. 1. is a section giving a general view of the rela- 
tive situations of the well, and the main 
through the river leading to the pumps. 
Fig. % a vertical section through the pipe at one of 
the flexible joints. 
Fig. 3. a corresponding outside view. 
Fig. 4. ditto, plan. 
Fig. 5. ar cross section of the pipe and frame, 
Fig. 6. ditto of stock-joint and hinge. 
The demand for water having increased beyond expectation 
since 1810, (when this work was completed,) a second main of 
18 inches diameter, similar in all other respects to the first, has 
been since added. 
At present, the consumption of water is reckoned about 800Q 
tons per diem. The Company's establishment of engines is two 
