Compression experiments were made on columns formed from two circular cylinders of equal size with their flat ends in contact. From measurements of the diameters at various sections at and away from the junction, a measure of the end effect was obtained. The experiments were carried out on steel and brass cylinders in contact with one another, and with several diameters and contact-surface conditions. It was observed that the end effect with sand-blasted or physically joined ends disappeared after approximately two thirds of a diameter, irrespective of the diameter. This could easily be reduced to one third of a diameter by smoothing and lubricating the contact surfaces.

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