Description of a Water Wheel . 183 
EEEEE. The thumb- screws, which keep the rings 
and tubes firm in their proper places. 
F. Two points formed on the lower ring : they are to 
stick into the timber., and to enable the tube to be held 
firm in its place. 
Fig. 5. 
Shows the separation of the parts of the tube, which 
is effected by slackening the thumb-screws and rings. 
To put them together, you slide the rings over the 
joints, placed as close as possible; then, by tightening 
the thumb-screws, you will have them firm together, and 
may continue the tubes to any length, from one foot to 
whatever number is required. 
Fig. 6. 
GH. Two steel punches or drifts, to be placed on the 
head of the copper bolt within the tube, whilst driving. 
The blow given upon the punch drives forward the bolt. 
The shortest of them should be used first, and, when 
driven nearly to its head, should be taken out of the tube, 
and the longer punch applied in its place. 
No. 34. 
Description of a Water Wheel. By Mr. J. Besant.* 
[With an engraving.) 
SIR— I beg leave to lay before the Society for the 
Encouragement of Arts, some observations respecting 
the common Undershot Water-wheel, and to point out 
the superiority of that of my invention. 
* Nicholson, vol. 3, p. 49. From the Transactions of the Society for the En- 
couragement of Arts , Ifc, 
