400 SEC. 12. APPLIED MECHANICS. 



198O. Model of Dawes' and Holt's Hydraulic Shears. 



In order to avoid buckling or bending either half of plate cut in 

 two, a strip of metal equal to the thickness of the plate is sheared 

 out of the plate, and the gap thus formed is utilized to allow the 

 plate to pass the tie connecting the upper and lower blades ; this 

 machine can thus cut any size of plate. 



Henry S. Holt, C.E., Leeds. 



2027. Model of a Hoist or Lift. Patented by Thomas 

 Silver in 1872. The principle of this invention is applicable to 

 ascending gradients. 



Lent from the Patent Office Museum by the Commissioners 

 of Patents. 



2027a. Model of Spout used in Sunderland Docks for 

 loading vessels with coals. 



River Wear Commissioners, Sunderland. 



2027b. Model of Loading Drops used in Sunderland 

 Docks for loading steam colliers with coals. 



River Wear Commissioners, Sunderland. 



2O27c. Model of Apparatus for raising Heavy Spherical 



Bodies. Bennet Woodcraft, Esq., F.R.S. 



2028. The Original Traversing Lifting Jack. Patented 

 by George England in 1839. 



Lent from the Patent Office Museum by the Commissioners 

 of Patents. 



2029. Four methods of converting Rectilinear into 

 Circular" Motion. 



Lent from the Patent Office Museum by the Commissioners 

 of Patents. 



2030. Bar Lathe used by James Watt. 



Bennet Woodcroft, Esq., F.R.S. 



2030a. Circular Best, for turning spheres nearly up to 

 the full diameter of the lathe. The Rest being also adapted for 

 holding all kinds of plain tools or the " drill," " universal," and 

 " eccentric " " cutting frames," &c., with overhead motion. 



Tyssen Amhurst. 



2030b. Spherical Chuck (with six extra collars), for 

 finishing spheres and chucking them for ornamental and other 

 purposes. Invented by the exhibitor. Tyssen Amhurst. 



2O30c. Specimen in ivory turned by the above apparatus, 

 consisting of a series of spheres detached one within the other, in 

 Chinese fashion. Tyssen Amhurst. 



