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## multiplying

```  2  definitions  found

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Lens  \Lens\  (l[e^]nz),  n.;  pl  {Lenses}  (-[e^]z).  [L.  lens  a
lentil.  So  named  from  the  resemblance  in  shape  of  a  double
convex  lens  to  the  seed  of  a  lentil.  Cf  {Lentil}.]  (Opt.)
A  piece  of  glass,  or  other  transparent  substance,  ground  with
two  opposite  regular  surfaces,  either  both  curved,  or  one
curved  and  the  other  plane,  and  commonly  used  either  singly
or  combined,  in  optical  instruments,  for  changing  the
direction  of  rays  of  light,  and  thus  magnifying  objects,  or
otherwise  modifying  vision.  In  practice,  the  curved  surfaces
are  usually  spherical,  though  rarely  cylindrical,  or  of  some
other  figure.  Lenses

Note:  Of  spherical  lenses,  there  are  six  varieties,  as  shown
in  section  in  the  figures  herewith  given:  viz.,  a
plano-concave;  b  double-concave;  c  plano-convex;  d
double-convex;  e  converging  concavo-convex,  or
converging  meniscus;  f  diverging  concavo-convex,  or
diverging  meniscus.

{Crossed  lens}  (Opt.),  a  double-convex  lens  with  one  radius
equal  to  six  times  the  other

{Crystalline  lens}.  (Anat.)  See  {Eye}.

{Fresnel  lens}  (Opt.),  a  compound  lens  formed  by  placing
around  a  central  convex  lens  rings  of  glass  so  curved  as
to  have  the  same  focus;  used  especially  in  lighthouses,
for  concentrating  light  in  a  particular  direction;  --  so
called  from  the  inventor.

{Multiplying}  {lens  or  glass}  (Opt.),  a  lens  one  side  of
which  is  plane  and  the  other  convex,  but  made  up  of  a
number  of  plane  faces  inclined  to  one  another,  each  of
which  presents  a  separate  image  of  the  object  viewed
through  it  so  that  the  object  is  as  it  were  multiplied.

{Polyzonal  lens}.  See  {Polyzonal}.

From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]:

Multiply  \Mul"ti*ply\,  v.  t.  [imp.  &  p.  p.  {Multiplied};  p.  pr
&  vb  n.  {Multiplying}.]  [F.  multiplier,  L.  multiplicare,  fr
multiplex  manifold.  See  {Multitude},  {Complex}.]
1.  To  increase  in  number;  to  make  more  numerous;  to  add
quantity  to

Impunity  will  multiply  motives  to  disobedience.
--Ames.

2.  (Math.)  To  add  (any  given  number  or  quantity)  to  itself  a
certain  number  of  times;  to  find  the  product  of  by
multiplication;  thus  7  multiplied  by  8  produces  the  number
56;  to  multiply  two  numbers.  See  the  Note  under
{Multiplication}.

3.  To  increase  (the  amount  of  gold  or  silver)  by  the  arts  of
alchemy.  [Obs.]

{Multiplying  gear}  (Mach.),  gear  for  increasing  speed.

{Multiplying  lens}.  (Opt.)  See  under  {Lens}.
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