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Minor adjustments which may be made with each assembly are: moving the position of the barrel by sliding it through the pipe clamps, C, until proper release of the air is made at the end of the stroke, increasing the number (but not the size) of the holes where air is released, increasing the size of the air inlet, and adjusting the tension and the position of the platform. When correctly assembled and regulated, the machine should start promptly with admission of air a t d, run continuously, and require no further adjustment for loads which vary from a gram to 1.5 kg. Higher weight limits have not been tried.The arrangement given in this description is for an apparatus in which only a few changes have been made with the starting materials. 1 'Since the stroke in this machine need not be more than 2 inches (5 cm.) long a t the most, it should be possible to cut down the length of the barrel and piston rod to proportionate size, reducing the apparatus to almost half the space formerly occupied. It should also be possible to mount the barrel under the shaking platform by use of suitable connections. The use of smaller springs will give a longer stroke. The same system of springs may be used with some advantage on motor-driven shakers. ACKNOWLEDGMENTThe author is indebted to E. C. Curtis for valuable aid in the construction and assembling of this apparatus.

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