idity
with which this is done defies accurate timing by a stop watch in the
hands of an expert. It is practically true, therefore, that the time
consumed by the operator in handling any one call is that which is taken
in getting the number from the subscriber and in repeating it back to
him.

TABLE XI

Total Time Consumed by Operator in Handling Calls on Automanual System

+-----------------------------------------------------------------+
| First 100 Calls |
+-----------------------------------------------------------------+
|Longest Individual Period 12.40 seconds |
|Average five longest Individual Periods 7.44 seconds |
|Average ten longest Individual Periods 6.34 seconds |
|Shortest Individual Period 1.60 seconds |
|Average five shortest Individual Periods 1.92 seconds |
|Average ten shortest Individual Periods 1.96 seconds |
|Average Entire 100 Calls 3.396 seconds |
|Hourly Rate at which calls were being handled 1060 |
+-----------------------------------------------------------------+

+-----------------------------------------------------------------+
| Second 100 Calls |
+-----------------------------------------------------------------+
|Longest Individual Period 7.60 seconds |
|Average five longest Individual Periods 5.52 seconds |
|Average ten longest Individual Periods 5.34 seconds |
|Shortest Individual Period 2.00 seconds |
|Average five shortest Individual Periods 2.04 seconds |
|Average ten shortest Individual Periods 2.18 seconds |
|Average Entire 100 Calls 3.374 seconds |
|Hourly Rate at which calls were being handled 1067 |
+-----------------------------------------------------------------+

+-----------------------------------------------------------------+
| Third 100 Calls |
+-----------------------------------------------------------------+
|Longest Individual Period 5.40 seconds |
|Average five longest Individual Periods 5.32 seconds |
|Average ten longest Individual Periods