III. PRIME MOVERS. 391 



1959. Two Hydrostatic Rotary Engines with table to 

 which eccentric motion is conveyed. The machines were in- 

 vented by the exhibitor for the purpose of facilitating the solution, 

 aggregation, or precipitation of chemical compounds, which they do 

 as effectually in half an hour as if the solutions were allowed to 

 stand for 24 hours (tested by quantitative experiments). The 

 table is open in the centre, so that a beaker or flask may be 

 heated by a Bunsen burner, and it is furnished with double-sliding 

 clamps so as to securely hold the vessel in its place. 



A, engine intended for delicate quantitative experiments. 



B, engine for ordinary purposes. 



Joseph William Thomas, Cardiff. 



1960. Working Model of Atmospheric Engine, with sun and 

 planet motion. Glasgow Mechanics' Institution. 



1963. 



1963. Model of a patent direct acting " Universal " steam 

 pump, as used for pumping water from mines, or for other pur- 

 poses where simplicity of construction and economy of space 

 are matters of importance. Hayward Tyler $ Co. 



1964. Drawing showing a longitudinal and a cross section 

 through the steam cylinder of " Universal " steam pump, showing 

 steam piston with slide valve therein, and the arrangement of 

 ports. Hayward Tyler fy Co. 



1965. Wood Model to show the action of a recent im- 

 provement in the mechanism of the " Universal " steam pump 

 for high " lifts ; " the slide valve being contained in a valve chest 

 outside the cylinder, and allowing of the use of an ordinary 

 steam piston, thus allowing a longer stroke without lengthening 

 the cylinder. Hayward Tyler fy Co. 



1966. Drawing illustrative of the arrangement of slide valve, 

 &c. for the "long stroke" "Universal" steam pump for high 

 lifts. Hayward Tyler $ Co. 



1967. Model of horizontal engine (novel girder pattern), 

 with portion of cylinder removable to show the action of a variable 

 automatic expansion valve gear (Rider's patent), controlled directly 

 by the governor. The expansion valve works on the back of the 

 lower valve by a separate eccentric in the ordinary manner, but 

 owing to its triangular shape, and the form of the parts, the point 

 of cut-off changes according to the angular motion of the valve 

 round its spindle. This angular rotation is produced by the rise 

 and fall of the governors through rack and quadrant. Any 

 acceleration in speed thus affects the rise and fall of the governor 

 balls, and accelerates or delays the time of steam admission. 



Hayivard Tyler $ Co. 



