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Bronze (tin, aluminum or other element) Aluminium bronze ; Arsenical bronze (arsenic, tin) Bell metal ; Bismuth bronze ; Brastil (alloy, bronze) [5] [6] Florentine bronze (aluminium or tin) Glucydur (beryllium, iron) Guanín (gold, silver) Gunmetal (tin, zinc) Phosphor bronze (tin and phosphorus) Ormolu ; Silicon bronze (tin, arsenic, silicon)
The Mach number is named after the physicist and philosopher Ernst Mach, [3] in honour of his achievements, according to a proposal by the aeronautical engineer Jakob Ackeret in 1929. [4] The word Mach is always capitalized since it derives from a proper name, and since the Mach number is a dimensionless quantity rather than a unit of measure ...
An important contribution to the wider adoption of AC traction came from SNCF of France after World War II. The company conducted trials at 50 Hz, and established it as a standard. Following SNCF's successful trials, 50 Hz (now also called industrial frequency) was adopted as standard for main lines across the world. [54]