This is a progress report on the marine gas turbine and free-piston gas turbine during the 5-yr period, 1953–1957. Since the merchant and naval services encompass many similar operating conditions—in spite of many differing requirements—the entire marine field will be reviewed in a single paper. In the first report [18], separate papers appeared on marine, merchant, and naval applications.

Open and closed-cycle gas-turbine, nuclear gas-turbine, and free-piston gas-turbine prime movers will be discussed along the following lines: Applications, operating experience, development, advantages, disadvantages, economics, and the future potential in the marine field.

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