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by means of control experiments.
It is, however, frequently not feasible to construct a gage sufficiently light and rigid to make this possible.
A new method developed by W. M. Bleakney, and presented in the Journal for June (RPIooj), consists in so adjusting the ratio of stiffness to inertia of the parts of the gage that these deformations are compensating.
The indication of the instrument may thus be made independent of any acceleration of the gage as a whole. This method is being used in the design of an electromagnetic strain pick-up unit developed for the Navy Department for the recording of strains in airplanes during flight. The Massachusetts Institute of Technology and the Sperry Gyroscope Company are collaborating in this work. Further applications of the compensation principle will, no doubt, be found as improved instruments for measuring dynamic strains 1)ecomc available. SOIL CORROSION TESTING.
π SIMILAR VOLUMES
Metallurgists have long been "corrosion-conscious" and this state of mind is rapidly extending to metal users in general. Methods for determining the corrodibility of metals vary greatly, and uniformity in testing of this kind is greatly to be desired. With this thought in mind, the American Society
## Abstract The corrosion behaviour of magnesium alloys is not substantially comparable to other metals, such as iron, nickel and copper. It is always accompanied by hydrogen evolution. More hydrogen is evolved at a more positive potential or a higher anodic current density. The βstrangeβ hydrogen