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27.

streams, sent in all directions, (i.e. virtually reconverted into heat); and secondly, a [[underlined]] friction method [[/underlined]], whereby the individual stream remains moving in one direction, but is gradually slowed down by friction against a solid surface.

As will be shown below, accurate results were obtained by the first method, in what may be called the "cylindrical" tank; and these results were checked satisfactorily by the second method, in what will be called the "circular" tank.

The cylindrical tank was 10 feet 5 inches high and weighed about 500 lbs. It consisted of a 6-foot length [[underlined]] T [[/underlined]], Figs. 17 and 18, of 12-inche steel pipe, with threaded caps on the ends. Entering the upper cap at a slight angle was the 3-inch pipe [[underlined]] P [[/underlined]], 4-1/2 feet long which supported the cap [[underlined]] C [[/underlined]] of Figs. 14 and 15. The 12-inch pipe was sawn across at the dotted line [[underlined]] T [[/underlined]] [[subscript]]  o [[/subscript]], so that any devi[[strikethrough]] s [[/strikethrough]] ^[[c]]e could be placed in the interior of this tank, or removed from it, as desired. The upper section of the tank was lifted off as occasion demanded by a block and tackle. The two ends to be joined were first painted with the wax previously described; and after the tank had ben assembled, the joint was pained on the outside with the same wax, [[underlined]] W [[/underlined]], and the entire tank thereafter painted with asphalt varnish.

This tank was used under three conditions:

1st. Tank empty, with the elbow [[underlined]] E [[/underlined]] to direct the gas into a swirl such that the gas, while in motion, would not tend to return up the pipe [[underlined]] P [[/underlined]]. In this case, some rebound was to be expected from this elbow. This expectation was realized in practice.

2nd. Tank empty, and elbow cut off along the dotted line [[underlined]] E [[underlined]] [[subscript]] o [[/subscript]]. In this case, more rebound was to be expected than in Case 1; which was borne out in practice.