In our description of this invention, published on page 344, current volume (issue of Nov. 27, 1869), an'important point claimed by t.he inventor was omitted. Ifthe reader will again refer to the engraving he will see that the vent tube, whkh also acts as a brace bemeen the nozzle and breast of the can, terminates at the letter A, which represents an. opening in the side of the nezzle, through which air enters while the oil is flowing out of the nozzle. As soon, however, as the oil rises in the lamp as high as the vent hole, A, it covers this hole, and the flow of oil from iihe filler is checked. The fluid as it flows over the end of the vent tube, produces an audible whistling sound, which ceases when the vent hole is stopped by the rising of the fluid in the lamp, as the flow then ceases. Thus a metal lamp or one made of any opaq ua material, as well as one of transparent glass, can be filled without danger of its running over, the fiUer stopping automatically when the lamp is filled to the proper hight. The advantage of controlling the flow is gained by the simplest means, and all danger of overflow prevented.
This article was originally published with the title "H. W. Staples' Automatic Lamp-Filler" in Scientific American 21, 24, 371 (December 1869)