IX. NAVAL ARCHITECTURE, ETC. 525 



2178hf. Drawings of the High Pressure Tubular 

 Boilers of the paddle-wheel steam yacht " Galatea." Front 

 and end elevations. Section through firing end. Cross section. 

 Plan. 



Nominal horse-power, 200. Scale of drawing, 1 inch to 1 foot. 

 Heating surface of two boilers of ship, 308 square feet ; fire-grate 

 surface, 186 square feet. Water space, 1,392 cubic feet. Steam 

 space, 732 cubic feet. William Willis. 



These drawings represent reproductions of the originals by Willis' Aniline 

 Process. Executed by Vincent Brooks & Co. 



2178hg. Drawing of Compound Marine Screw Engines. 



Side elevation and end elevation. J. Dickinson. 



2178hh. Drawing of Dickinson and Mace's Patent 

 Marine and Land Boilers. ./. Dickinson. 



Two mid-sections ; front and longitudinal elevation. Sectional plans. 



2178hi. Drawing representing proposals by Messrs. E. J. 

 Reed, C.B., and W. Wimshurst, for a method of lowering and 

 raising the screw propeller at ship's stern to suit her variable draft 

 of water, and to avoid " racing " of the engines. J. F. Flannery. 



2178hj. Model and Drawings of improved Water Tube 

 Marine Steam Boilers. E. Wigscll. 



2178hk. Willan's Patent Three Cylinder High Speed 



Engine for steam launches. Hunter 8$ Enylish. 



2178hl. Steam Launch Screw Propeller for the three 

 cylinder engine. Hunter fy English. 



The three cylinders are placed side by side. The three pistons work on to 

 three cranks on the shaft set at angles of about 120. Each cylinder is single- 

 acting the steam acting on the top only of each piston. 



The connecting rods are jointed at one end to the pistons, at the other end 

 to the cranks on the shaft. 



Each piston acts as a steam valve, by which steam is supplied to one of the 

 other pistons. On the return stroke of the pistons towards the top of the 

 cylinder, the lower part in the cylinder is uncovered to allow the steam to 

 pass back out of the cylinder into the casing surrounding the crank shaft. 



2178hm. Small size High Pressure Quick Speed 

 Three Cylinder Horizontal Engine for screw launches, P. 

 Brotherhood's patent. Brotherhood fy Hardingham. 



2178hn. Models of Hirsch's Screw Propellers as fitted 

 to H.M.S. "Minotaur," and SS. "Pereine," French Atlantic 

 service. H. Hirsch. 



