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v<,l„™,T..„6i  OCTOBER  1916


ENLARGING— nXTING  THEORY  TO
PRACTICE.     PART  I.     C.  H.  CLAUDY

THERE  are  learned  books  about  the  optics  of  the  camera  and  the  lantern,
the  lens  and  the  negative,  the  paper  and  the  image,  all  of  which  will
repay  study.  But  most  amateurs  are  after  results  first  and  abstract
knowledge  later.
These  two  papers  are  intended  to  present  to  the  reader  the  essentials  of
the  theory  of  enlarging,  and  the  practical  application  of  the  theory  to  practice
without  any  intention  to  go  more  deeply  into  the  subject  than  is  necessary  to
get  results.
It  seems  obvious  that  he  who  knows  something  of  the  "why"  of  what  he
does,  will,  in  the  long  run,  get  better  results  in  any  photographic  operation
than  he  who  knows  only  that  he  must  do  thus-and-so  to  obtain  such-and-thus
a  result.  The  one  is  in  a  position  to  reason  about  his  work,  the  other  but  a
slavish  manipulator  of  apparatus,  who  is  lost  the  instant  he  gets  off  the  beaten
track  or  is  confronted  with  some  problem  not  set  down  in  his  instruction  sheet.
So  it  seems  logical  to  begin  with  a  short  exposition  of  the  theory  of  making
enlargements.
There  are  many  methods.  Two,  however,  stand  out  above  the  rest  in
amateur  practice — and  these  two  are  but  modifications  of  the  same  thing.
They  are  the  processes  of  making  enlargements  by  the  use  of  an  enlarging
lantern,  and  that  of  making  enlargements  in  the  camera.  The  first  usually
employs  an  artificial  light  source,  the  other  a  natural  source.  Each  has
special  advantages,  which  will  be  discussed  later.
