The article provides some theoretical foundations for the technical calculation and critical evaluation of jaw crushers. The general advantages of jaw crushers are high throughput, simplicity of design, low cost, and ease of repair; the disadvantages are the intermittent nature of operation and the presence of large oscillating masses, which generate strong noise during operation and cause vibrations in the factory building. Therefore, the issue of balancing a jaw crusher is very important for practice. Typically, one jaw is fixed, while the other receives oscillations from the drive mechanism. The author examines the design types of jaw crushers, the arrangement and shape of the jaws, and defines the optimal shaft speed, throughput, energy consumption, and other parameters (see the article).

Precise speed control of engines and machines constitutes one of the most important tasks of modern mechanical engineering. This book aims to fill these gaps and represents an attempt at a systematic exposition of the practically applied theory of drum governors, primarily based on the author's own research and six years of experience in the design and construction of drum governors. The work covers in detail the following topics: centrifugal and drum governors, kinematics, statics, dynamics of drum governors, their design, and other issues.