VI. MACHINERY. 401 



2032. Instrument for dividing and ruling the Brass Me- 

 ridian Rings of Globes, made by Jas. Ferguson, Esq., F.R.S. 

 (the astronomer). Bennet Woodcroft, Esq., F.R.S. 



2036a. Grover's Patent Holdfast Washers for securing 

 nuts of fish bolts, and all bolts in machinery exposed to vibration. 



T. W. Grover, C.E. 



2037. Photograph and Model representing an Hydraulic 

 Canal Lift at Anderton, in Cheshire, constructed by Messrs. 

 Emmerson, Murgatroyd, & Co., of Stockport and Liverpool, for 

 the trustees of the River Weaver navigation, under the superin- 

 tendence of Mr. Edwin Clark and Mr. Sidengham Duer. 



This lift affords an easy and expeditious means of transferring laden barges 

 between the Trent and Mersey Canal, and the River Weaver, instead of the 

 tedious and costly process, previously in use, of transhipping goods from one 

 set of barges to another. The canal is on the top of a bank, and the river 

 is 50 feet 4 inches below it. Two barges can be transferred from the river 

 to the canal, and two others from the canal to the river, in eight minutes ; 

 whereas in a chain of locks, where the difference of level is the same, 

 only half that work can be performed in an hour and a half. It is pre- 

 eminently useful wherever water is scarce, as it only takes about one per 

 cent, of the water from the upper level which is used by the chain of locks. 

 The photograph is from the work itself, while the model is only intended to 

 show how one of the troughs, having taken a depth of 6 inches water over its 

 area from the upper level, descends to the river, and in doing so lifts the 

 other one nearly to the level of the canal by means of a central vertical 

 hydraulic ram under each of the troughs. The rest of the operation is per- 

 formed by a small steam engine. It was opened for public traffic by the 

 trustees of the Weaver in July last, and has been in constant and successful 

 operation since that time. The whole apparatus and other works in con- 

 nexion with it are fully described by the exhibitor, and its applicability for 

 lifting large ships is discussed in the " Minutes of the Proceedings of the 

 Institution of Civil Engineers." 



Sidengham Duer, B.Sc. 



2038. Somerville's Machine for charging and drawing gas 

 retorts by steam power. 



It is constructed to run along the floor of retort house in front of retorts 

 upon a line of rails or tramway, and consists of a platform on wheels, upon 

 which is fixed a boiler and engine, which propels it and gives motion to the 

 various parts. On the same platform is erected an upright frame, which 

 serves as a support to the cradle or secondary platform carrying the scoop 

 for charging or filling, and the rake for drawing the retorts ; on top of frame 

 is a receptacle (over the scoop) which is supplied with coals from another 

 receptacle below by means of an elevator or Archimedean screw, whereby 

 the scoop is filled with coals. The rake is attached in a similar manner to 

 the scoop, and is propelled and withdrawn in the same way. 



John Somerville, Dublin. 



2039. Model of a Californian Stamping Mill. 



Royal Saxon Mining Academy, Freiberg. 

 39508. C c 



