[Illustration:  Longitudinal Section.  Elevation.  Transverse Section.]

Referring to the illustration, the gas enters the washer by the pipe, A, which terminates in the form of a [Symbol:  inverted T].  One end (a) of this pipe is bolted to the center of one of the sides of the cylindrical portion of the case, in which there is a hole of similar diameter to the pipe; the other (a’) being formed by the face-plate of a stuffing-box, B, through which passes the central shaft, C, supported by the plummer-block, D, as shown.  This shaft has upon its opposite end a plate perforated with holes, E, which is fixed upon the flange of a horizontal pipe, F. This pipe is closed at the other end by means of a plate, E’, furnished with a spindle, supported by a stuffing-box, B’, and carrying a fly-wheel, G. The central pipe, F, is perforated with a number of small holes.  The gas entering by the pipe, A, makes its way into the central pipe through the openings in the plate, E, and passes into the cylindrical case through the small holes in the central pipe, which carries the brooms, H. These are caused to rotate rapidly by means of the pulley, I; and thus a constant shower of water is projected into the cylindrical case.  When the gas has been several times subjected to the washing process, it passes off by the pipe, K. Fresh cold water is supplied to the vessel by the pipe, L; and M is the outlet for the tar.—­Journal of Gas Lighting.

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THE WIND MILL.

[Footnote:  A paper read before the Engineers’ Club of St. Louis, 1884.]

By James W. Hill.

In the history of the world the utilization of the wind as a motive power antedates the use of both water and steam for the same purpose.

The advent of steam caused a cessation in the progress of wind power, and it was comparatively neglected for many years.  But more recently attention has been again drawn to it, with the result of developing improvements, so that it is now utilized in many ways.

The need in the West of a motive power where water power is rare and fuel expensive has done much to develop and perfect wind mills.

Wind mills, as at present constructed in this country, are of recent date.

The mill known as the “Eclipse” was the first mill of its class built.  It is known as the “solid-wheel, self-regulating pattern,” and was invented about seventeen years ago.  The wind wheel is of the rosette type, built without any joints, which gives it the name “solid wheel,” in contradistinction to wheels made with loose sections or fans hinged to the arms or spokes, and known as “section wheel mills.”

The regulation of the Eclipse mill is accomplished by the use of a small adjustable side vane, flexible or hinged rudder vane, and weighted lever, as shown in Plate 1 (on the larger sizes of mills iron balls attached to a chain are used in place of the weighted lever).  The side vane and weight on lever being adjustable, can be set to run the mill at any desired speed.