90 LAWRENCE HARGRAVE. 



Some of the members will see the one-wheeled car in 

 their mind's eye without any more description, but Pigs. 

 1, 2. 3, have been made from the full sized drawing, 

 so that those who do not understand English may also 

 participate in the knowledge this paper is meant to convey; 

 in particular French and German readers. No sizes have 

 been marked, it being sufficient to state that the tire is 24 

 inches outside diameter. 



The upper casing A lifts off with the fixed crank shaft 

 attached, and the engine and gyro- wheel loose on the upper 

 bearing. The gyro- wheel then unscrews from its fasten- 

 ings to the cylinder and crank case. The split bearings 

 are then taken apart, releasing the lower spindle and allow- 

 ing the piston to be withdrawn. The washer on the end 

 of the crank pin being removed, the rod, piston, and piston 

 counter l>a la nee lift off. Then the hall* piston pin is 

 unscrewed and the whole thing is on the floor as we say. 



The engine is a short stroke valveless Koerting engine, the 

 fresh air admission is shown, but I think it an unnecessary 

 refinement at this stage. The crank chamber is 

 cylindrical, and a continuation of the cylinder with pro- 

 vision to alter its volume and adjust its weight to that of 

 the cylinder and its parts. The end flanges are turned on 

 the main bearing centres to fit the inner diameter of the 

 gyro- wheel. The gyro- wheel is made of two truncated 

 cones with the smaller diameters screwed together and 

 to the cylinder flanges, the larger diameters hook over 

 the steel channelled wheel which is wrapped and loaded 

 with piano wire or gun tape. The lower spindle sits on 

 balls at E. The friction pulley may slide on a feather on 

 the lower spindle so as to alter the ratio of the gear. The 

 friction disc 'is shown dotted at F. The cranking handle O 

 is on the bottom casing, and the gyro engine is started 

 before the lever G permits the tired wheel to slide up its 



