1 rials  of  Agricultural  Motors. 
183 
Travelling  wheels — rear  driving,  4 ft.  diam.  by  ] ft.  8|  in.  wide  ; 
front,  3 ft.  1 in.  diam.  by  7 in.  wide. 
Over-all  dimensions,  12  ft.  6 in.  by  6 ft. 
Total  tank  capacity,  200  gallons. 
Heating  surface,  64  sq.  ft. 
Grate  area,  2.8  sq.  ft. 
Two  speeds,  2|  and  5 miles  per  hour. 
Steam,  180  lb. 
(3)  Wallis  and  Steevens,  Limited,  North  Hants.  Iron  Works, 
Basingstoke.  A compound  steam  tractor  of  the  road  loco- 
motive type  (Fig.  4). 
THE  WALLIS  TRACTOR, 
Fig.  4. — Wallis  & Steevens’  Compound  Steam  Tractor,  mounted 
on  springs,  engine  parts  enclosed  and  running  in  oil  bath. 
Fast  and  slow  speeds. 
Net  weight,  4 tons  19  cwt.  3 qrs. 
Engine  cylinders — high  pressure,  4f  in.  diam.  by  9 in.  stroke ; 
low  pressure,  8\  in.  diam.  by  9 in.  stroke. 
Travelling  wheels — rear  driving,  4 ft.  ll|  in.  diam.  by 
1 ft.  4 in. ; front,  3 ft.  3j  in.  diam.  by  6 in. 
Over-all  dimensions,  13  ft.  by  6 ft.  4^  in. 
Total  tank  capacity,  159£  gallons. 
Coal  bunker,  3 cwt. 
Steam  pressure,  160  lb. 
