LVI. T. W. SEAVER. 



The author has designed a joint, by means of which the 

 above advantage can be secured in connection with gates 

 of the Chanoine type by forming the ends of the upper 

 horizontal axis into sectors upon which the shutter rests, 

 and with which they are kept in contact by means of D 

 straps. Fig. 9. 



A great loss of water takes place in storage reservoirs 

 owing to the flood water which has been backed up by the 

 dam running off to the sill level of the byewash. At the 

 Bhatghar Dam, in India, a series of gates slide in grooves 

 in front of the byewash, and are almost balanced by counter- 

 poises inclosed in chambers left in the masonry. When 

 the water reaches its maximum level it flows by means of 

 pipes into these chambers the outlets of which are smaller 

 than the inlets. The weights of the counterpoises being 

 thus much reduced, the gates fall and allow the excess of 

 stored water to escape. When the level falls below the 

 inlet pipes the water in the chambers escapes, so that the 

 full weight of the counterpoises again coming into play, 

 the gates are raised and the water impounded in the 

 reservoir. 



The author has designed a gate which effects the same 

 purpose, but in a different manner, and which requires no 

 chambers in the masonry. This gate is a compound one, 

 consisting of a falling framework hinged to the floor of the 

 byewash, and supporting a bascular gate between its 

 vertical members. A simple tumbling plank hinged to the 

 top of the main gate, when upright, keeps the bascular 

 gate in position by means of a latching gear. The action 

 of this regulating gate is as follows : — When the water rises 

 to the fixed level it turns the top board over, and releases 

 the catch, the bascular gate then swings open, thus 

 taking most of the pressure off the framework, which is 

 held in position by chains passing round wheels at the floor 



