eretofore, it would appear quite To the Editor of the Scientific American: It, therefore, follows that upon the operation of the possible to formulate a set of rules which would make Upon my return last evening from a ten days' trip engine, the disk, G, is given a back-and-forth rotation it easy to… … square against it as usual, and the landing was made hibited to the public, are placed in a space to which AN IMPROVED ENGINE INDICATOR. all access is forbidden, for making repairs, etc., ac- at a speed of 45 to 50 miles an hour. One side of the cording to what is known as the "inclosure system."…
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