metrical process. Thus, if the length of AB, in fig. i, represents the
amplitude of the resultant curve, AC, CB, the amplitudes of the two
components, then, upon forming a triangle of the three, as in the
figure, the angle BCC will represent the phase difference of the two
components, BAG will represent the phase difference between the
resultant and the first component, and ABC the phase difference
between the resultant and second component.
An image should appear at this position in the text. To use the entire page scan as a placeholder, edit this page and replace "{{missing image}}" with "{{raw image|Proceedings of the Royal Society of London Vol 69.djvu/90}}". Otherwise, if you are able to provide the image then please do so. For guidance, see Wikisource:Image guidelines and Help:Adding images. |  |
Applying these to the case under consideration, AC may be re- garded as representing the temperature oscillation undisturbed by the effect of the sea temperature, CB the effect of the sea and AB the result- ant effect or the actual temperature oscillation observed at the station. The angle ABC will represent the number of degrees of phase differ- ence between the sea curve and the station curve, i.e., practically, the number of days between the time of maximum on shore and on sea, and so on for the other angles. Of such a triangle for any station, the following elements are known : the resultant amplitude AB, the lag of the sea effect behind the land curve, i.e., the angle ABC. The position of C is indeterminate because we do not know the actual magnitude of the sea effect BC, nor the magnitude or epoch of the undisturbed effect. But we know the extreme position of AC : it cannot correspond to a curve with an earlier maximum than June 21,
