In the fall of 1954 the undersigned had occasion to investigate the discovery of an eastern fluted projectile point in an excavation being made for the erection of a flagpole memorial to the man who originated the Tadpole Club. In preparation for this expedition to a Boy Scout camp near the Delaware Water Gap we decided to build a motor-driven sifter. This machine has operated so well on this and succeeding trips that it seems to warrant a brief description.

The accompaning sketch (Fig. 128) shows the basic principles. The screen, mounted at a slant on 1/4-inch thick plywood legs, is free to move back and forth due to the flexibility of the plywood. A little experimentation demonstrated that about 150 strokes was right for most sifting operations.