No coin nor oath required. For personal study only.
Naval Architects and Marine Engineers in New York, Mr. Kennedy pointed out that "every increase of approximately 2 5 degrees in steam temperature for a given pressure means an improvement of approximately one per cent. in heat rate."
Stating that the Navy has for several years operated a destroyer using I2OO lb., 9oo F. steam, Mr. Kennedy indicated that merchant ship turbines can and will be built for those conditions. A great share of the credit for progress up to the present, according to the speaker, is due to a few progressive ship builders, naval architects and operators.
The problem of designing marine turbines for higher pressures and temperatures has been materially simplfied for manufacturers who have had years of experience in building similar machines for large central station power plants, Mr. Kennedy said Along with higher steam conditions, higher turbine rotative speeds also offer many advantages according to Mr. Kennedy.
"Some of these advantages are improved efficiency and shorter spans between bearings, thereby simplifying expansion problems due to temperature. Shorter spans mean fewer alignment problems, smaller shafts and less paeking leakage; higher revolutions mean lower weights and tend to lower costs," he said.
R. H. O.
๐ SIMILAR VOLUMES
High Power Audio Amplifier.-A new variable-frequency audio amplifier (type FG 5/10) capable of delivering either 5 or 10 kw. output power is available from the Westinghouse Electric Corporation. This power amplifier will take a signal of about 10 milliwatts from any conventional 30 to 10,000 cps. s
Vacuum ][]rake.--The engineers of the French Northern Railway have made satisfactory experiments with the vacuum brake. MM. Sartiaux and Lartique have devised some ingenious arrangements for bringing it into automatic action, if any mistake is made respecting the crossings. Distressed passengers, wh