THE MICROGRAPH

The Micrograph

A new instrument for observing and recording small changes of mechanical pressure by making use of the phenomena of the interference of light has recently been described. 1 Several important changes in the instrument have been made since the original communication, and the development of its applications has been in steady progress. In the present paper, an account is given of some results obta...

A Study of the Presphygmic Period with the Micrograph

A series of tracings is given in text-figure I, taken with films moving at the rate of 17.2 inches per second, in order to measure the time intervals with more accuracy than was possible with the lower speed. This speed is nearly three times that of the films from which the records were made in a former paper. 1 At this higher speed, approximately one cardiac cycle only is recorded on the lengt...

A Comparison of Simultaneous Polygraph and Micrograph Tracings

FROM A STUDY OF THE ACCOMPANYING TRACINGS WE MAY CONCLUDE THAT: 1. The delicate mechanism of the micrograph registers the movements in the heart and blood-vessels more accurately than does the polygraph. 2. The inertia of the polygraph lever and diaphragm distorts the tracing. The difference between the results obtained with the two instruments is shown by the records made simultaneously with t...

Quantitative Evaluation of Transmission of X-ray Micrograph

X-ray transmission depends on a composition element and its thickness of the specimen. When a highly collimated beam of monoenergetic photons passes through a medium of the thickness , it suffers a decrease in intensity according to the relation t ) exp( 0 t I I M ρ μ − = , where M μ is the mass absorption coefficient, and ρ is the density, is the incident beam intensity. In case of compound, A...

Fluorescence Micrograph Segmentation by Gestalt-Based Feature Binding