872  LINOLEUM  MANUFACTURE. 
against  the  albumenized  surface  of  the  print,  when-,  presto  !  the 
"  magic  photograph  "  is  produced,  and  is,  when  washed,  as  per- 
manent as  many  of  the  photographs  of  the  present  day.  The 
image,  by  being  again  immersed  in  the  bichloride  of  mercury 
solution,  may  be  once  more  rendered  invisible,  and,  by  the  hypo- 
sulphite solution,  again  restored  as  often  as  may  be  desired. 
Although  we  believe  that  this  process  of  magic  photography 
has  been  patented  a  few  weeks  since,  every  intelligent  photo- 
grapher who  has  made  himself  acquainted  with  the  past  history 
of  our  art-science,  knows  that  many  years  have  elapsed  since  this 
u  magic  "  process  was  first  practised. 
The  amusement  that  can  thus  be  introduced  into  the  social 
circle  by  the  "  magic  photographs  "  may  be  easily  conceived. — 
Journal  Franklin  Institute,  June,  1866,  from  London  British 
Journal  of  Photography,  No.  312. 
LINOLEUM  MANUFACTURE. 
The  manufacture  of  this  new  and  interesting  material,  which 
threatens  to  rival  the  india-rubber  trade  in  the  multiplicity  and 
utility  of  its  applications,  is  based  on  the  invention  of  Mr.  Fred- 
erick Walton,  whose  patents  are  now  worked  by  the  Linoleum 
Manufacturing  Company,  at  Staines,  and  45  Cannon  Street, 
West.  The  word  linoleum  is  derived  from  linus  (linseed),  and 
oleum  (oil),  from  which  products  the  new  substance  is  made.  The 
linseed  oil  of  commerce  is  solidified  or  "oxydized"  by  the  ab- 
sorption of  oxygen,  by  which  process  it  becomes  changed  into  a 
semi-resinous  substance.  It  is  then  combined  at  a  strong  heat 
with  resinous  gums  and  other  ingredients,  and  the  substance  thus 
obtained  has  all  the  appearance  and  many  of  the  properties  of 
india-rubber. 
"  Those  who  are  conversant  with  the  uses  of  the  pliable  elastic 
gums  readily  perceive  the  wide  field  of  usefulness  that  any  ma- 
terials possessing  such  properties  is  designed  to  occupy,  more 
especially  as  the  price  of  the  new  substance  is  much  lower  than 
india-rubber  or  gutta-percha.  Linoleum  can  also  be  dissolved 
into  a  varnish  or  cement  in  the  same  manner  as  india-rubber,  and 
in  this  form  can  be  employed  in  the  manufacture  of  material  for 
