Forty-one distinct inventions relating to the phonograph, covering various forms of recorders, arrangement of parts, making of records, shaving tool, adjustments, etc. Eight forms of electric lamps using infusible earthy oxides and brought to high incandescence _in vacuo_ by high potential current of several thousand volts; same character as impingement of X-rays on object in bulb. A loud-speaking telephone with quartz cylinder and beam of ultra-violet light. Four forms of arc-light with special carbons. A thermostatic motor. A device for sealing together the inside part and bulb of an incandescent lamp mechanically. Regulators for dynamos and motors. Three devices for utilizing vibrations beyond the ultra-violet. A great variety of methods for coating incandescent lamp filaments with silicon, titanium, chromium, osmium, boron, etc. Several methods of making porous filaments. Several methods of making squirted filaments of a variety of materials, of which about thirty are specified. Seventeen different methods and devices for separating magnetic ores. A continuously operative primary battery. A musical instrument operating one of Helmholtz's artificial larynxes. A siren worked by explosion of small quantities of oxygen and hydrogen mixed. Three other sirens made to give vocal sounds or articulate speech. A device for projecting sound-waves to a distance without spreading, and in a straight line, on the principle of smoke-rings. A device for continuously indicating on a galvanometer the depths of the ocean. A method of preventing in a great measure friction of water against the hull of a ship and incidentally preventing fouling by barnacles. A telephone receiver whereby the vibrations of the diaphragm are considerably amplified. Two methods of "space" telegraphy at sea. An improved and extended string telephone. Devices and method of talking through water for a considerable distance. An audiphone for deaf people. Sound-bridge for measuring resistance of tubes and other materials for conveying sound. A method of testing a magnet to ascertain the existence of flaws in the iron or steel composing the same. Method of distilling liquids by incandescent conductor immersed in the liquid. Method of obtaining electricity direct from coal. An engine operated by steam produced by the hydration and dehydration of metallic salts. Device and method of telegraphing photographically. Carbon crucible kept brilliantly incandescent by current _in vacuo_ for obtaining reaction with refractory metals. Device for examining combinations of odors and their changes by rotation at different speeds. It must be borne in mind that the above and hundreds of others are not merely _ideas_ put in writing, but represent actual inventions upon which Edison worked and experimented. In many cases the experiments ran into the thousands, requiring months for their performance.