94 
HAROLD’S DISCUSSIONS. 
It is astonishing to find how much pressure there 
is against the side of a house if the wind strikes it 
squarely. A gale would exert a pressure of about 
800 pounds on the side of a small house. 
Next I secured a good thermometer and tested it, 
as explained in Book III. Then I ruled foolscap 
paper lengthwise so as to have ten half-inch col¬ 
umns, leaving the right margin for Bemarks. This 
gave a column each for the Day of the Month, 
Temperature, Barometer, Wind, Sky, Precipitation, 
Dew or Frost, Fog, Moon’s Phases, and Evening or 
Morning Star. Every evening at six o’clock I re¬ 
corded my observations. 
The thermometer was recorded in degrees, and 
the barometer in inches and tenths of an inch; the 
wind was indicated by an arrow flying in the direc¬ 
tion of the wind, and as long as space would j^ermit 
if the wind was very strong; frequently I added the 
force in pounds to the square foot. When the sky 
was fair I placed a circle in the column. When it 
was cloudy I shaded the circle, and when only partly 
cloudy I shaded a proper portion of it. The shading 
was in parallel lines if the clouds were of the cirrus 
type, in little squares if cumulus, and solid when the 
clouds were an unbroken mass. The phases of the 
moon were shown, wdien new by a circle, then by a 
narrow crescent, increasing the shading until the full 
moon filled the entire circle. The initial letters were 
used for the other items. Under Remarks were such 
as these: “ The wind increased until three o’clock 
and then diminished ” ; ‘‘ Drop of 35° from eleven to 
