Show shortening of f the th day for a long time it has ha been bea 1 cnown nowa that the tides act as an a brake oi 01 I 1 the rotating earth and that they tog tei id 1 to lengthen lenit nen the day the effect Is I 1 however so ao slight that it cannot be measured in any length of time at mn mans disposal it aay be with the aid of 0 certain assumption and upon the data available ava lable macmillan has 1 made the necessary necea necess sury ury by the formula used by engineers engineer I 1 ha find tor for the increase of the leneth of the day one second in year harpers harper weekly V |