﻿THE 
  

  

  AMERICAN 
  JOURNAL 
  OF 
  SCIENCE 
  

  

  [THIRD 
  SERIES.] 
  

  

  Art. 
  XXX 
  Y. 
  — 
  Daily 
  March 
  of 
  the 
  Wind 
  Velocities 
  in 
  the 
  

   United 
  States 
  ; 
  by 
  Frank 
  Waldo, 
  Princeton, 
  New 
  Jersey. 
  

  

  [The 
  following 
  matter 
  is 
  extracted 
  from 
  a 
  paper 
  prepared 
  by 
  the 
  writer 
  

   for 
  the 
  Weather 
  Bureau 
  of 
  the 
  Agricultural 
  Department, 
  and 
  is 
  published 
  with 
  

   the 
  kind 
  permission 
  of 
  the 
  proper 
  authorities.] 
  

  

  Ix 
  the 
  Appendix 
  'No. 
  ltt 
  to 
  the 
  Chief 
  Signal 
  Officer's 
  Annual 
  

   Report 
  for 
  1890, 
  the 
  average 
  wind 
  movement 
  is 
  given, 
  for 
  a 
  

   large 
  number 
  of 
  stations, 
  in 
  miles 
  per 
  hour 
  for 
  each 
  hour 
  of 
  

   the 
  day 
  (1 
  to 
  24), 
  for 
  each 
  month 
  of 
  the 
  year, 
  and 
  also 
  the 
  

   averages 
  for 
  all 
  of 
  the 
  months 
  of 
  the 
  seven 
  years 
  1883-89. 
  

  

  This 
  presents 
  most 
  valuable 
  data 
  and 
  is 
  certainly 
  the 
  most 
  

   unique 
  of 
  the 
  tabular 
  compilations 
  published 
  by 
  the 
  Weather 
  

   Bureau. 
  Hitherto 
  we 
  have 
  relied 
  mainly 
  on 
  the 
  papers 
  pub- 
  

   lished 
  by 
  Hann 
  and 
  Koppen 
  for 
  collected 
  data 
  concerning 
  the 
  

   daily 
  period 
  of 
  wind 
  velocities, 
  and 
  even 
  in 
  these 
  there 
  are 
  

   comparatively 
  few 
  places 
  of 
  observation 
  taken 
  into 
  account. 
  

   The 
  publication 
  of 
  such 
  data 
  as 
  those 
  which 
  we 
  are 
  considering, 
  

   from 
  a 
  large 
  number 
  of 
  stations 
  having 
  a 
  variety 
  of 
  immediate 
  

   exposures, 
  and 
  distributed 
  over 
  so 
  large 
  a 
  portion 
  of 
  an 
  entire 
  

   continent, 
  furnishes 
  material 
  for 
  a 
  very 
  complete 
  treatment 
  of 
  

   the 
  subject 
  of 
  hourly 
  winds. 
  The 
  present 
  paper 
  is 
  mainly 
  

   devoted 
  to 
  a 
  view 
  of 
  the 
  conditions 
  of 
  the 
  geographical 
  distri- 
  

   bution 
  of 
  some 
  important 
  phases 
  of 
  the 
  daily 
  march 
  of 
  the 
  

   wind 
  velocities. 
  The 
  material 
  is 
  sufficiently 
  rich 
  to 
  serve 
  as 
  a 
  

   basis 
  for 
  a 
  number 
  of 
  similar 
  and 
  more 
  complete 
  investigations. 
  

  

  The 
  hourly 
  wind 
  velocities 
  as 
  originally 
  published 
  are 
  

   arranged 
  according 
  to 
  synchronous 
  hours 
  of 
  the 
  75th 
  meridian 
  

   time. 
  It 
  is 
  inconvenient 
  in 
  that 
  form 
  for 
  many 
  kinds 
  of 
  inves- 
  

  

  Asi. 
  Jour. 
  Scl— 
  Third 
  Series, 
  Vol. 
  XLIX, 
  No. 
  294.— 
  June, 
  1895. 
  

   29 
  

  

  