up is a hand the fullest advantage, and the engine is readily re- wrench. It has been patented by Mr. John H. Green, line, a second ball is suspended to a fixed point, to versed by simply shifting the lever to change the po- of No. 604 Pine Street, Ishpeming, Mich. The trian- which is given a known… … of the curves traced by the two balls will always remain ments from which lead the exhaust pipes. The valve the same. It is suggested that an apparatus of this GREEN’S CAMERA STAND. stem of the slide valve is pivotally connected with a kind would be useful in studying the vibrations of the lever…
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