O. T. Mason, "Psychological Literature," The American Journal of Psychology, 1888.


The accompanying cut illustrates a new aesthesiometer designed by Dr. Joseph Jastrow, of the Johns Hopkins University. The essential parts of the instrument are as follows: A base, A, to which is attached a pair of uprights, D D'; a block, B, upon which rests a frame, C, for receiving the arm which is held in position by grasping the band as shown in the cut. A fine millimeter-scale, O, with two arms, P P', through which it is fastened at E at any desired angle.