———  r
2  SCIENTIFIC  BOOKS  PUBLISIIED  BY

Francis’  Lowell  Hydranlics.
Third  Edition.
4to.  Cloth.  $15.00.
LOWELL  HYDEAULIC  EXPERIMENTS  —  being  a  Selection
  from  Experiments  on  Hydraulic  Motors,  on  the  Elow  of
Water  over  Weirs,  and  in  Open  Canals  of  Uniform  Rectangular
Section,  made  at  Lowell,  Mass.  By  J.  B.  Francis,  Civil  Engineer.
Third  edition,  revised  and  enlarged,  including  many  New  Experiments ­
  on  Gauging  Water  in  Open  Canals,  and  on  the  Flow
through  Submerged  Orifices  and  Diverging  Tubes.  With  23
copperplates,  beautifully  engraved,  and  about  100  new  pages  of
text.
The  work  is  divided  into  parts.  Part  L,  on  hydraulic  motors,  includes
ninety-two  experiments  on  an  improved  Foumeyron  Turbine  Water-Wheel,
of  about  two  hundred  horse-power,  with  rulea  and  tables  for  the  construction
of  similar  motors;  thirteen  experiments  on  a  model  of  a  centre-vent  waterwheel
  of  the  most  simple  design,  and  thirty-nine  experiments  on  a  centre-vent
water-wheel  of  about  two  hundred  and  thirty  horse-power.
Part  II.  includes  seventy-four  experiments  made  for  the  purpose  of  determining ­
  the  form  of  the  formula  for  computing  the  flow  of  water  over  weirs;
nine  experiments  on  the  effect  of  back-water  on  the  flow  over  weirs;  eightyeight
  experiments  made  for  the  purpose  of  determining  the  formula  for  computing ­
  the  flow  over  weirs  of  regulär  or  Standard  forms,  with  several  table»
of  comparisons  of  the  new  formula  with  the  results  obtained  by  former  experimenters;
  five  experiments  on  the  flow  over  a  dam  in  which  the  crest  was  of  the
same  form  as  that  built  by  the  Essex  Company  across  the  Merrimack  River  at
Lawrence,  Massachusetts;  twenty-one  experiments  on  the  effect  of  observing
the  depths  of  water  on  a  weir  at  different  distances  from  the  weir;  an  extensive ­
  series  of  experiments  made  for  the  purpose  of  determining  rules  for
gauging  streams  of  water  in  open  eanals,  with  tables  for  facilitating  the  same;
and  one  hundred  and  one  experiments  on  the  discharge  of  water  through  submerged ­
  orifices  and  diverging  tubes,  the  whole  being  fully  illustrated  by
twenty-three  double  plates  engraved  on  copper.
In  1855  the  proprietors  of  the  Locks  and  Canals  on  Merrimack  River  consented
  to  the  publication  of  the  first  edition  of  this  work,  which  contained  a
selection  of  the  most  important  hydraulic  experiments  made  at  Lowell  up  to
that  time.  In  this  edition  the  principal  hydraulic  experiments  made  there,
subsequent  to  1855,  have  be*u  added,  including  the  important  series  above
mentioned,  for  determining  rules  for  the  gauging  the  flow  of  water  in  open
oanals,  and  the  interesting  series  on  the  flow  through  a  submerged  Yenturi’s
tube,  in  which  a  larger  flow  was  obtained  than  any  we  find  recorded.