G30 
LIEUT.-GENERAL R. STRACHEY ON HARMOXIC AXALYSIS OF 
operating in the same direction, or the third component if negative being over¬ 
powered by the other two, which from 10 a.m. to 4 p.m. are always positive. 
The temperature curve between the hours of 4 a.m. or 5 a,m. and 7 a.m. or 8 a.m. 
always falls below the first component. 
The first component having its maximum about 2 p.m. is always negative between 
8 P.M. and 8 A.M. 
The second component having a day maximum which varies between 11.30 a.m. to 
1.30 P.M. is always negative between 4 a.m. and 8 a.m. In the summer months 
when the third component is largest, it is also negative between 4 a.m. and 7 a.m., 
and at other seasons, when it would operate in an opposite direction, its relatively 
small magnitude renders its efiects unimportant. 
The second component always having a maximum near noon will also have another 
near midnight. 
In the summer months when the third component has a minimum shortly following 
noon, it will have a maximum shortly following midnight, that is nearly at the same 
time as the second component, and at this season the night temperature is found to 
be considerably above the first component. In the winter months the third 
component becomes negative during the hours when it was before positive, and the 
departure of the night temperature from the first component is much smaller. 
In the summer months the time of morning mean temperature is nearly when the 
first component becomes zero, the second and third components then balancing one 
another. 
In the winter the hour of morning mean temperature is later, and occurs when a 
positive value of the first component equals a negative value of the second. 
The time of afternoon mean temperature throughout the year is somewhat either 
before or after 7 p.m., and almost exactly coincides with the time when the first and 
second components are equal but with opposite signs, the former being positive and 
the latter negative. 
In the summer months the whole of the components are negative between the 
hours of 3 A.M. and 6 a.m., corresponding with the absolute minimum about this 
time. 
In the winter the third and fourth components are not negative till after 6 a.m., 
while the negative branch of the first component is extended almost to 9 a.m., and 
the absolute minimum is found correspondingly later between 7 a.m. and 8 a.m. 
The hour of absolute maximum is nearly coincident Avith that of the dominant first 
component, which is always between 2 p.m. and 3 p.m., the modifications due to the 
second component, which also has a maximum between noon and 2 p.je., being of 
secondary importance. 
Sunrise in December is about an hour and-a-half before the time of mean tempera¬ 
ture, while in June it is more than four hours before that time. 
