Improved Device for Measuring the Deformation of Wood Specimens in Compression Parallel to the Grain

Standard compressometers depend on uniform surface motion of the specimen at the point of attachment to the instrument. Since wood is non-homogeneous, it may become distorted under stress. To overcome this disadvantage, a modification was made to one particular instrument to enable it to function regardless to strain, irregularity, or buckling action of the specimen. Working drawings of the modification are shown. The universal-joint principle allows this device to function freely, plane cross sections can rotate without binding or tearing at points of attachment.

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