Salt Lake Tribune | 1914-06-07 | Page 46 | How the Eart Ebbs and Flows like the Tides in the Seal

! How the Earth EBBS and FLOWS Like the TIDES in the SEi ' 1jVERYBODY knows how the ocean ebbs and flows , ! r-t in what we call tides. But until now it has never ; j J 4 been understood that the solid parts of the j ! earth's surface are subject to a similar ebb and flow, . j although of lesser extent than the ocean. ! The fact that there are tides of about a foot in the ! earth's surfaces of rock and soil has just been sclen j titically demonstrated at the University of Chicago. ! The demonstration was made by a series of remark- iable experiments extending over a period of two months. First a pipe, six inches in diameter and four hundred feet, long, was buried in the ground at a depth of six , feet in order to insure constancy of temperature. This pipe was then half filled with water. At intervals of two hours both night and day for two months measurements were made with microscopes of the changes in the level of the water at both ends of this pipe. These measurements showed that the attraction attrac-tion of the sun and moon caused regularly recurring tides In the pipe just as it does in the sea. -Copyright. 19t4. by the Star Company. Great Britain I The result of the experiment shows the striking fact S that the interior of the earth is not a molten, viscous I mass, as has been popularly believed, but resists the tidal forces of the moon and sun about as It would if ? the earth were made of solid steel. i Nevertheless, the earth, in spite of this high rigidity. behaves as an elastic body, not liquid, of conn still subject to the same influences (producing tides are the oceans which form part of it. This discovery is of the greatest importM" an astronomical and geological point of view, " similar experiments are to be undertaken.