. Hours of exercise in the s subsequent fall intothe valleys, would possess the heat and dryness ofthe Fohn. These qualities are, therefore, no proofthat the origin of the Fohnwind is Sahara. It will probably be remembered that I deducedthe formation of glaciers, and their subsequentmotion through valleys of varying width and flexure,from the fact that when two pieces of ice are pressedtogether they freeze together at their places ofcontact. This fact was first mentioned to meverbally by its discoverer, Faraday. Soon after-wards, and long before I had occasion to reflectupon its cause,
. Hours of exercise in the s subsequent fall intothe valleys, would possess the heat and dryness ofthe Fohn. These qualities are, therefore, no proofthat the origin of the Fohnwind is Sahara. It will probably be remembered that I deducedthe formation of glaciers, and their subsequentmotion through valleys of varying width and flexure,from the fact that when two pieces of ice are pressedtogether they freeze together at their places ofcontact. This fact was first mentioned to meverbally by its discoverer, Faraday. Soon after-wards, and long before I had occasion to reflectupon its cause, the application of the fact to tlieformation and motion of glaciers flashed upon was in the yard of the Eoyal Institution at thetime; stuffing a quantity of it into a steel mould, 18Cr,] HELMHOLTZ ON ICE AND GLACIERS. 379 which I had previously employed to demonstrate*he influence of pressure on magnetic phenomena,I squeezed the snow, and had the pleasure of seeingit turn out from the mould as a cylinder of trans- Fig. lucent ice. I immediately went to Faraday, andexpressed the conviction that his little outlyingexperiment would be found to constitute the basisof a true theory of glaciers. It became subsequentlyknown to me that the Messrs. Schlaaintweit had 380 HELMHOLTZ ON ICE AND GLACIERS. [1863 made a similar experiment with snow; but they didnot connect with it the applications which suggestedthemselves to me, and which have since been de-veloped into a theory of glacier-motion. A section of the mould used in the experimentabove referred to is given in the foregoing B is the solid base of the »mould ; c d e f a hollowcylinder let into the base; p is the solid plug usedto compress the snow. When sufficiently squeezed,the bottom, a b, is removed, and the cylinder ofice is pushed out by the plug. The mould closelyresembles one of those employed by ProfessorHelmholtz. The subsequent development of the subject bythe moulding of ice into various forms by pre
Size: 1104px × 2263px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectmountai, bookyear1896
