At present experimental design and scientific-research work in machine building is accompanied by massive strain measurement of parts and assemblies both on the system of parts and on test equipment [i]. The development of modern mechanisms and machines requires the greatest possible increase in the strength of critical parts with the minimum weight and high technological effectiveness. Evaluation of the load, strength, and life by calculation methods is frequently difficult as a result of the poorly taken into consideration action of service conditions on the load and limiting characteristics of strength of parts. Therefore, experimental methods of evaluation of the load and strength of highly loaded machine elements have become widely used.