Word: chambered
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Dates: during 1960-1969
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...aboard the spacecraft designed without another complete system to back it. Like other systems, the engine had duplicate parts made to take over if its tanks, valves or propellant lines failed. But space and weight limitations had forced the manufacturer, Aerojet-General Corp., to include only a single combustion chamber, fuel injector and nozzle extension skirt (see illustration). The failure of any of these parts could have meant disaster...
...ensure reliability, engineers tried to make the engine as simple as possible. Devoid of any frills, the SPS engine consists basically of a combustion chamber and propellant (fuel and oxidizer) tanks. When valves to these tanks are opened, fuel flows from one tank and oxidizer to the other to meet in the combustion chamber, pushed by pressurized helium that takes the place of potentially troublesome pumps. Because the propellants are hypergolic-they react chemically and ignite on contact-no ignition system is needed. And to avoid including a complicated throttle, the engine burns only at its fully rated thrust...
...drafty provincial churches are cherished by the world's finest choruses. Keyboard exercises that he jotted down for his children and students still beguile and challenge great virtuosos. Instrumental pieces that he com posed to curry favor with obscure princelings are judged among the glories of all chamber music...
...court conductor at Weimar, Bach landed a similar position with Prince Leopold of Anhalt-Cothen; the defection so angered Duke Wilhelm that Bach was clapped in the Weimar jail for a month. Once he arrived at Cothen, Bach devoted five placid, productive years to superb keyboard and chamber pieces, including the French Suites for harpsichord, the unaccompanied music for cello and violin, and the six Brandenburg Concertos. This period is usually labeled Bach's secular phase, though he was not fussy about the distinction between sacred and secular. Bach often borrowed from his secular music for sacred occasions, just...
...invited him to the court at Potsdam. When he arrived, Frederick immediately dismissed his minions, exclaiming: "Old Bach is here!" The two then spent an evening together, and Bach delighted Frederick by improvising a fugue on one of Frederick's themes. After returning home, Bach wrote an extensive chamber cycle on the same theme and sent it to Frederick with the title Musical Offering. Soon after this, Bach's overworked eyes as well as his rugged constitution began to fail. Two operations on his eyes only weakened him further. Finally, at 65, just before dying...