﻿Work 
  Measured 
  by 
  the 
  Discharge 
  of 
  Carbon 
  Dioxide. 
  243 
  

  

  or, 
  in 
  words, 
  the 
  cost 
  of 
  raising 
  the 
  body 
  1 
  metre 
  (at 
  a 
  speed 
  of 
  - 
  25 
  metre 
  

   per 
  second) 
  will 
  carry 
  the 
  body 
  horizontally 
  9 
  - 
  01 
  metres 
  at 
  a 
  speed 
  of 
  

   T8 
  metres 
  per 
  second. 
  

  

  i 
  min. 
  5 
  io 
  15 
  20 
  25 
  30 
  35 
  40 
  45 
  5o 
  

   Labourer 
  No. 
  1.— 
  Walking 
  at 
  1*8 
  metres 
  per 
  second. 
  Weight 
  = 
  87*2 
  kilom. 
  

  

  The 
  " 
  20-metre 
  staircase 
  " 
  in 
  connection 
  with 
  the 
  Physiological 
  Laboratory 
  

   of 
  the 
  University 
  of 
  London, 
  used 
  for 
  estimating 
  work 
  in 
  these 
  observations, 
  

   includes 
  an 
  allowance 
  for 
  the 
  horizontal 
  path 
  involved 
  in 
  walking 
  upstairs. 
  

   The 
  staircase 
  has 
  103 
  steps, 
  7-inch 
  rise, 
  9-inch 
  tread, 
  and 
  short 
  landings, 
  

   making 
  up 
  a 
  total 
  horizontal 
  distance 
  of 
  28 
  yards, 
  of 
  which 
  the 
  vertical 
  value 
  

   has 
  been 
  assumed 
  at 
  one-fifteenth. 
  The 
  effective 
  value 
  of 
  the 
  20 
  yards 
  is 
  

   thus 
  20 
  + 
  1*867 
  yards, 
  i.e., 
  20 
  metres. 
  The 
  value 
  of 
  the 
  horizontal 
  in 
  terms 
  

   of 
  vertical 
  was 
  assumed 
  as 
  one-fifteenth 
  in 
  accordance 
  with 
  the 
  findings 
  of 
  

   Zuntz 
  and 
  others, 
  but 
  from 
  my 
  own 
  observations 
  (unfinished) 
  I 
  am 
  disposed 
  

   to 
  take 
  a 
  larger 
  fraction, 
  i.e., 
  about 
  one-tenth, 
  for 
  the 
  relation 
  for 
  moderate 
  

   speeds, 
  viz., 
  100 
  yards 
  per 
  minute, 
  on 
  the 
  Hat, 
  or 
  10 
  yards 
  per 
  minute 
  

   vertically. 
  The 
  point 
  will 
  be 
  more 
  fully 
  considered 
  in 
  a 
  future 
  report 
  on 
  the 
  

   energy 
  output 
  of 
  walking 
  and 
  running 
  on 
  the 
  flat. 
  If 
  the 
  fraction 
  one-tenth 
  

   should 
  prove 
  nearer 
  the 
  mark 
  than 
  one-fifteenth, 
  a 
  corresponding 
  correction 
  

   of 
  the 
  horizontal 
  allowance 
  will 
  have 
  to 
  be 
  made 
  for 
  the 
  20-metre 
  staircase 
  ; 
  

  

  