"These are some of the problems which Mr. Keely has had to solve before he could adapt his vibratory machinery to the etheric flow. The true conditions for transmitting it sympathetically through a differential wire of platinum and silver have now been attained, after eight years of intense study and elaborate experiment. The introductory indications began to show themselves about two years ago, but the intermissions on transmission were so frequent and so great as to discourage Mr. Keely from further research on this line. Then came one of those "inspirations" which men call "accident," revealing to him "the true conditions" necessary to produce a sympathetic flow, free of differentiation, proving conclusively the truth of his theory of the law governing the atomic triplets in their association. Differentiation, by compound negative vibration of their neutral centres, causes antagonism, and thus the great attractive power that aggregates them becomes one of dispersion or expansion, accompanied by immense velocity of rotation, which carries its influence through the whole volume of air, 230 cubic inches contained in sphere, within its 33 1/3 chord of its circle of coincidence. By this wire of platinum and silver the current of force is now passed to run the vibratory disk, thus altogether upsetting the "compressed air" theory of Professor Barkes, Dr. Hall, and others of less note."
"In setting the conditions of molecular sympathetic transmission by wire," writes Keely, "the same law calls for the harmonious adjustment of the thirds, to produce a nonintermittent flow of sympathy. Intermission means failure here. That differential molecular volume is required, in two different mediums of molecular density, to destroy differentiation of sympathetic flow, seems at first sight to controvert the very law established by the great Creator, which constitutes harmony - a paradoxical position which has heretofore misled physicists who have propounded and set forth most erroneous doctrines, because they have accepted the introductory conditions, discarding their sympathetic surroundings. The volume of the neutral centre of the earth is of no more magnitude than the one of a molecule: the sympathetic conditions of one can be reached in the same time as the other by its coincident chord." [Sympathetic Vibratory Force]
"Generator" was six feet long and corresponding wide and high, but failing to make the arrangement automatic upon which its mechanical usefulness depended, Keely found a new standard for research in an experiment often made by himself, but never before successful, which resulted in invention in 1885 of the "Liberator" not so large as a lady's small round worktable. He made astonishing progress with this beautiful piece of vibratory mechanism, so as to combine the production of the power, operation of the cannon, his engine and his disintegrator in a machine no larger than a dinner plate and only three or four inches in thickness. This was completed in 1886, up to which time his experiments were upon the principle of sympathetic vibration, for liberating a vapory or etheric product. His later experiments were another modification of vibratory sympathy, and the size of the instrument used now, 1888, for the same purposes is no larger than an old fashioned silver watch. A pressure of 30,000 lbs. to the square inch in raising of the lever, and all other operations, without one ounce of pressure in any part of the apparatus, are effected by the ether. The force is transmitted along a wire of platinum and silver. Keely has named this new modification "Negative Attraction." The two forms of force with which he has experimented and the attendant phenomena, are exactly antithetical. It is by changing the vibrations of the cosmic ether that Keely releases this energy. Dr. Dupuy, of New York, experimented along these lines for many years, but without success to the degree Keely had." [KEELYS SECRETS - 1888] [underline added]
"Demonstrating the overcoming of gravity, Keely used an airship model weighing about 8 lbs., which, when the differentiated wire of silver and platinum was attached to it, communicating with the sympathetic transmitter, rose, descended, or remained stationery midway, the motion as gentle as that of thistledown floating in the air." [KEELYS SECRETS - 1888]