. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 5.—Paramagnetic sphere placed in a Fig. 6.—DiainaRnetic sphere placed in previously straight field. a previously straight field. nearly at, say, , and the two most recent Cavendish experiments agree at, say, , ])ut 1 confess I think it is merely a coincidence. I have no doubt that the torsion experiment is the more exact, though probably an experiment on different lines was worth making, and I am quite content to accept the valu
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. 5.—Paramagnetic sphere placed in a Fig. 6.—DiainaRnetic sphere placed in previously straight field. a previously straight field. nearly at, say, , and the two most recent Cavendish experiments agree at, say, , ])ut 1 confess I think it is merely a coincidence. I have no doubt that the torsion experiment is the more exact, though probably an experiment on different lines was worth making, and I am quite content to accept the value as the standard value for the present. And so the latest research has amply verified Newton's celebrated guess that "the (Quantity of the whole matter of the earth may be five or six times greater than if it consisted all of ; I now turn to another line of gravitational research. AVhen we compare gravitation with other known forces (and those which have been most closely .studied are electric and magnetic forces) we are at once led to in(}uire whether the lines of gravitative force are always straight lines radiating from or to the mass round which they center, or whether, like electric and magnetic lines of force, they have a pref- erence for .some media and a distaste for others. We know, for example, that if a magnetic sphere of iron or colialt or manganese is placed in a previously straight field its permeability is greater than. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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