One  of  the  various  forms  of  jacks  shown  at  Fig.  363  should  be
included  in  the  equipment.  This  member  really  forms  part  of  the
tire-repair  outfit,  though  tlioy  are  used  on  many  occasions  in  making
repairs  when  the  tires  are  not  at  fault.  The  form  at  A  is  a  simple
lever-operated  type  having  a  double  ratchet.  A  series  of  short
strokes  will  raise  the  lifting  ram,  while  slightly  altering  the  magni-
tude of  the  stroke  will  allow  the  lifting  ram  to  fall.  In  the  jack
shown  at  B  the  lifting  ram  is  raised  by  means  of  gearing  enclosed
in  the  body  of  the  jack.  This  is  turned  by  means  of  a  socket  wrench,
having  a  handle  similar  to  a  bit  brace.  In  the  form  outlined  at  C
the  lifting  ram  has  a  screw  thread  cut  on  it  and  is  raised  by  a  bevel
gear  worked  by  a  hand  lever,  which  includes  the  ratchet  mechanism.
A  very  substantial  form  of  direct  lift  jack  is  shown  at  D.  The  type
outlined  at  E  is  used  to  raise  the  wheels  from  the  ground  quickly  and
easily  and  is  intended  for  garage  use.  These  are  sold  in  seta  of  four
and  are  used  by  many  motorists  to  raise  the  wheela  from  the  ground
and  relieve  the  tires  of  the  car  weight  when  the  vehicle  is  not  liable
to  be  used  for  a  few  days  or  a  longer  period.  The  selection  of  a  suit-
able jack  is  important,  and  while  almost  any  form  will  be  adequate
to  raise  a  light  car  the  motorist  should  be  sure  that  tliat  used  in
connection  with  a  hea^y  vehicle  has  ample  capacity  and  that  it  is  made


The  Modern  Gasoline  Automobile


701


of  steel  instead  of  treacherous  iron  castings,  such  as  incorporated
in  the  cheaper  jacks.
