Image from page 659 of “Collection of United States patents granted to Thomas A. Edison, 1869-1884” (1869)

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A few nice pressure regulators images I found:

Image from page 659 of “Collection of United States patents granted to Thomas A. Edison, 1869-1884” (1869)
pressure regulators
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Identifier: CollectionUniteVol2Edis
Title: Collection of United States patents granted to Thomas A. Edison, 1869-1884
Year: 1869 (1860s)
Authors: Edison, Thomas A. (Thomas Alva), 1847-1931 Peters, N. (Norris), lithographer Hammer, William Joseph, 1858-1934, former owner. DSI Edison, Thomas A. (Thomas Alva), 1847-1931, inscriber. DSI United States. Patent Office
Subjects: Catalogs Patents Edison, Thomas A. (Thomas Alva), 1847-1931 Inventions Telegraph Electric machinery Electric apparatus and appliances Phonograph Telephone Motors Catalogs Patents Catalogs Patents Catalogs
Publisher: Washington, D.C. : U.S. Patent Office
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Text Appearing Before Image:
ble device, suchas two concentric glass tubes with the inter-vening space filled with alum-water or otherbad conductor of heat, the object being to re-tain the heat of the incandescent metal andprevent loss by radiation, thus requiring lesscurrent to supply the loss by radiation. I am aware that the electric current has beenused to produce heat, and that such heat hasbeen employed to vary the relative position ofthe light-giving electrodes and the length ofthe intervening arc. In my light there is noelectric arc. I claim as my invention— 1. In combination with an electric light hav-ing a continuous incandescent conductor, athermostatic circuit-regulator, substantially asset forth. 2. In combination with an electric light, athermostatically-operated shunt, substantiallyas set forth. Signed by me this 5th day of October, A. D.1878. THOMAS A. EDISON. Witnesses: ALFRID SWANSON, Stockton L. Griffin. T. A. EDISON.Thermal-Regulator for Electric-Lights. No. 214,637. Patented April 22, 1879.

Text Appearing After Image:
N.PETERS, PHOTO-LITHOGRAPHER, WASHINGTON, 0 C. United States Patent Office, THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY.IMPROVEMENT IN THERMAL REGULATORS FOR ELECTRIC LIGHTS. Specification forming part of Letters Patent No. 214,637, dated April 22, 1879; application filed November 18, 1878. To all whom it may concern: Be it known that I, Thomas Alva Edison,of Menlo Park, in the State of New Jersey,have invented an Improvement in ElectricLights, of which the following is a specifica-tion. The object of this invention is to devise areliable and economical electric lamp, to givelight by incandescence due to the passage ofthe electric current through conductors ofelectricity, so that a great number of lampsmaybe used in one electric circuit. The invention consists in causing the heatgenerated by the incandescent conductor toexpand the air or fluid in the containing-cham-ber as its temperature rises, the pressure thuscreated serving to move outwardly a yieldingmaterial—such as a diaphrag

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