218  Miscellaneous  Implements  Exhibited  at  Gloucester,  1909. 
No.  3428. — Petrol  Motor  Waggon. — Exhibited  by  Ley  land 
Motors,  Ltd.,  Leyland,  Lancashire.  Three-ton  petrol-driven 
lorries,  35  H.P.  4-cylinder  engine,  four  speeds,  and  reverse. 
Price  of  Chassis  550^.  Fitted  with  “ live  ” axle,  instead  of  the 
more  usual  side  chains.  No  tongue  rods  are  used,  the  strain 
being  taken  by  the  special  casing  of  the  universal  shaft,  which 
works  in  spherical  joints,  the  universal  joints  being  thus  com- 
pletely protected  from  grit.  Steering  by  improved  Ackerman 
device,  a line  drawn  through  the  steering  pivots,  passing 
through  the  point  of  contact  of  wheel  with  ground,  the 
steering  being  thus  extremely  certain  and  easy. 
No.  4037. — Air  Compressor,  Scott's  Patent.  Manufactured 
by  J.  Petrie  & Co.,  Ltd. — Exhibited  by  the  Dudbridge  Iron 
Works,  Ltd.,  Stroud.  The  delivery  valves,  which  are  generally 
one  of  the  most  expensive  parts  of  the  upkeep,  are  of  a new 
and  apparently  highly  effective  and  simple  design.  A plate, 
forming  the  upper  part  of  the  compi-essing  cylinder,  is  drilled 
full  of  recessed  holes,  in  each  of  which  is  placed  a steel  ball, 
acting  as  a valve.  The  top  of  this  plate  is  covered  by  another, 
similarly  drilled  ; but  the  holes  of  the  two  are  staggered,  so 
that  the  balls  cannot  get  thrown  out  of  place.  Ball  valves  are 
usually  noisy,  and  wear  rapidly,  owing  to  the  constant  chattering 
of  the  ball  in  its  seat.  To  overcome  this  the  upper  part  of  the 
hole  is  so  little  larger  than  the  ball  that  the  rush  of  air  past 
keeps  the  ball  off  its  seat  until  completion  of  the  delivery 
stroke.  The  guaranteed  efficiency  is  95  per  cent.,  and  in  tests 
it  is  reported  that  97-4  per  cent,  has  been  obtained,  together 
with  the  unusually  low  temperature  of  210"  F.,  which  also  is 
guaranteed.  , 
Stand  365. — Crossley  Bros.,  Ltd.,  Openshaw,  Manchester. 
Among  other  interesting  exhibits  on  the  stand  of  this  well- 
known  firm  may  be  mentioned  No.  4038,  Producer  Gas 
Engine  of  14c.  B.H.P.  160  revolutions,  together  with  gas  pro- 
ducer. Price  425Z.  for  engine  only.  Fitted  with  compressed 
air  starting  gear,  piston  valve,  water  cooled  exhaust,  forced 
lubrication,  &c.  ; a fine  example  of  a most  interesting  type 
of  motive  power.  Where  constant  power  is  required  a pro- 
ducer gas  engine  is  probably  more  economical  than  any  other 
type  of  motive  power.  The  writer  had  a large  engine  of  this 
type  under  his  direct  supervision  for  a long  time.  Using 
Welsh  anthracite  coal  (cobbles),  the  cost  of  fuel  amounted  to 
about  one-tenth  of  a penny  per  H.P.  per  hour,  and  the  cost  of 
upkeep  and  attendance,  unskilled,  was  very  low.  Messrs. 
Crossley’s  design  and  workmanship,  of  course,  require  no 
criticism. 
Stand  377. — Fielding  & Platt,  Ltd.,  Atlas  Iron  Works, 
Gloucester.  A 30-B.H.P.  Producer,  or  Suction  Gas  Engine 
