by gas men in good standing. The patent office is full of alleged improvements, most of which will never emerge from musty oblivion. But few seem to be worthy of mention.

James T. Goodfellow and Frederick A. Sabbaton, of Troy, N. Y., June 17, 1873, patent 140,034, conceived a continuous treadmill arrangement shown in Fig. No. 16, wherein a continuous stream of gas was fed against a continuous stream of oxide, handled on an endless chain treadmill arrangement. I have no knowledge of the results of trial apparatus or any success obtained.

August Kloenne, of Prussia, August 17, 1880, patent 231,177, planned a vertical arrangement (shown in Fig. No. 17) of inclined trays in a tower purifier up through which the gas would flow and down through which a continuous zig-zag column of oxide would slowly work, being removed at the base by a water sealed worm screw. I have no knowledge of trial or results.

Henry C. Rew, of Chicago, December 25, 1883, patent 290,928, planned a vertical lime purifier with tilting or dumping trays, as shown in Fig. No. 18.

Wallace C. Andrews, then President of the Standard Gas Company, of New York, April 22, 1890, patent 426,092, planned also a box with dumping trays, as per Fig. No. 19. His especial idea was a shower of lime through which the gas would pass, and he built a tall, scrubber-like vessel, 40 feet high, in the Standard Works, New York, to try the plan, which, owing to clogging and other reasons, in practice entirely failed.

In 1897, I conceived the idea of a 4-deck or quadruplex purifying box, with dumping trays (Fig. No. 20), to save ground space, construction cost, etc., presenting the proposed plan in a paper entitled "A Quadruplex Purifying Box: Why Not?" at the American Gas Light Association meeting of 1897 (American Gas Light Journal, November 8, 1897). The paper is of interest in connection with purifying vessels, in showing how one line of thought or plan can be elaborated or carried out, but further thought has made me feel that the plan therein proposed was too complex. As a matter of fact such a box has not been tried, and I frankly feel that while possibly ingenious it is not the perfect box.

Mr. Henry G. Beatley, of Marquette, Mich., n 1898, at the March meeting of the Michigan Gas Association, in a paper entitled “A Closed Purifying Vesse!” (American Gas Light Journal, March 14, 1898), proposed a hopper arrangement of continuous oxide feed, against a stream of inflowing gas, carried out in an