Miscellaneous  Implements  Exhibited  at  Gloucester,  1909.  211 
carburation.  To  satisfy  ourselves  on  this  point  we  had  one  of 
the  Blackstone  engines  opened  up  ; this  engine  had  done  some 
weeks’  work  without  being  opened  up  or  the  internal  parts 
cleaned.  The  deposit  we  found  was  too  slight  to  be  of  any 
importance,  even  the  head  of  the  air  inlet  valve — which 
owing  to  its  comparative  coolness  always  shows  the  heaviest 
deposit — was  practically  clean.  Whilst  running,  the  exhaust 
was  clear  and  almost  without  objectionable  odour. 
The  engine  was  subjected  to  a three-hours’  full  power  run 
under  the  supervision  of  the  Society’s  Engineer,  Mr.  Courtney, 
C.E.,  during  which  time  it  gave  off  27-4  H.P.  being  60’5 
per  cent,  above  the  catalogue  H.P.  No  trouble  of  any  kind 
occurred,  nor  were  any  adjustments  made.  The  run  was  made 
on  Crude  Texas  Oil,  costing  50s.  per  ton  or  about  %\d.  per 
gallon,  the  amount  consumed  being  ‘58  of  a pint  per  B.H.P. 
per  hour,  the  cost  of  fuel  per  H.P.  per  hour  working  out  at 
T81  of  a penny. 
The  importance  of  this  extraordinary  economy  may  be 
judged  by  comparing  the  cost  of  running  on  paraffin  or  petrol 
and  presuming,  as  is  probably  correct,  that  an  equal  amount 
be  burnt  per  H.P. 
Cost  per  H.P.  per  hour. 
Crude  Oil  2§d.  per  gallon '181 
Paraffin  8d.  '562 
Petrol  15d.  1100 
or  taking  crude  oil  as  unity,  then — 
Crude  Oil 100 
Paraffin  ........  312 
Petrol  .........  6'08 
which  compares  very  favourably  with  the  cost  of  producer  gas 
engines.  A very  strong  point  in  favour  of  crude  oil  is  its 
freedom  from  danger  and  uselessness  for  any  other  purpose 
than  that  for  which  it  is  intended.  Crude  Texas  is  almost 
uninflammable,  in  fact  a bucketfull  thrown  on  to  a fire  of 
shavings  and  sticks  will  act  almost  as  if  it  were  water  instead  of 
oil.  In  view  of  the  great  danger  attaching  to  the  use  of  petrol 
in  and  about  farm  buildings  and  the  higher  fire  insurance 
premium  demanded  where  used,  this  point  is  of  special  value. 
Appended  is  Mr.  H.  Stanger’s  analysis  of  the  Crude  Texas  used 
in  above  trials. 
[Copy]. 
2,  Broadway, 
E.  H.  H.  Stangek,  Westminster,  S.W. 
July  3i'd,  1909. 
Dear  Sir,  Sample  of  Oil  fur  Test. 
In  accordance  with  your  instructions  of  the  30th  ult.  I have  tested  the 
sample  of  oil  (Crude  Texan)  received  therewith,  and  now  beg  to  report  the 
results  obtained. 
Specific  Gravity  at  60°  F.=-9435. 
Flash  Point  (close  test)=21:6  F.  (=119°  C.). 
