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The pulse-height distribution at the output of an electron multiplier structure for a single electron input has been calculated assuming a Poisson distribution at each stage. Graphs are given which illustrate the change in pulse-height distribution as a function of the number of stages. This has been done for interstage multiplications of 1.5, 2.0, 3.0, and 5.0.

The paper reviews the present state of knowledge and design techniques and attempts to provide a physical appreciation of the characteristics of bearing performance. The work which has been carried out recently in the United Kingdom, the United States, The Netherlands and Germany is examined and the paper attempts to relate this to experimental results and the practical engine. The possible relationships of components within the engine which affect the conditions of operation and parameters which could lead to improvement of these conditions are suggested and examined, and the possibilities of future work in exploring this area are indicated. Vol182 Pt 3A 52J. CAMPBELL, P. P. LOVE, F. A. MARTIN AND S . 0. RAFIQUE engine tests and the predictions of various theoretical methods. The case studied is the connecting-rod bearing of a Ruston and Hornsby 6VEB-X M k I I I 600-hp 600-rev/min diesel engine* (see Appendix 4.1 and Fig. 4.1) and more specifically the theoretical work referred to was carried out variously at the Glacier Metal Co. Notation b d hmin Jn c L 11. 1 M Ob 0, P ps R r S U

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