Trials  of  Agricultural  Motors. 
1ST) 
It  is  unnecessary  to  reproduce  these  here,  but  in  passing  it 
may  be  noticed  that  the  relative  costs  of  supply  in  the  field  of 
fuel  and  water  to  the  most  economical  steam  engine  and  to  that 
of  the  most  economical  internal  combustion  engine  were 
respectively  as  shown  in  table. 
The  trials  commenced  on  Tuesday,  August  9th,  with  the 
ploughing  of  the  field  shown  in  Fig.  1,  each  tractor  working  on 
a five-acre  plot,  and  ploughing  on  an  average  5 in.  in  depth  with 
the  three-furrow  plough,  which  is  sufficiently  illustrated  by  Fig.  7. 
Fig.  7. — Thbee-Fubbow  Plough  used  in  teials. 
The  plough  was  fitted  with  high  breast  and  to  turn  9 in. 
furrows,  and  was  well  suited  for  working  the  land,  which  was 
what  would  be  considered  light  land  and  in  a fairly  dry  condition, 
but  in  which  the  use  of  a somewhat  wider  share  would  have  been 
an  advantage.  Although  light  land,  it  was  not  of  the  kindliest 
description,  and  at  5 in.  depth  the  bed  of  the  furrow  was  either 
in  or  very  close  to  a chalk  bottom.  The  conditions  were,  however, 
practically  the  same  throughout  the  field. 
Table  2,  page  196,  of  Mr.  Courtney’s  Report,  gives  a summary 
of  the  figures  relating  to  the  different  motors  in  this  ploughing 
contest,  from  which  may  be  seen  the  time  occupied  in  ploughing 
each  of  the  plots,  the  fuel  and  water  consumed,  the  average 
speed  of  the  plough,  which,  it  may  be  here  remarked,  includes 
the  time  of  turning  at  the  headlands,  and  the  full  cost  per  acre 
ploughed.  The  average  speed  of  the  ploughing  bore  little  relation 
to  the  maximum  speed,  and,  indeed,  would  be  difficult  to  assign, 
Note. — Illustrations  Nos.  2,  3,  4,  6 and  7 appeared  in  the  Implement 
and  Machinery  Review,  and  the  Blocks  have  been  kindly  lent  by 
the  publisher,  Mr.  Harry  Westcott. 
