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nother interesting invention 1930s cars was made by GM . GM introduced the re-styling or face-lift of automobiles. Other automobile producers followed GM with the face-lift strategy. Before this face-lift operation by GM, you already could build your own car together by your own taste and view. But the change in philosophy of car producing throughout the 1930s was in fact that a car should be designed as a whole rather than as a bunch of collected parts. During the 1930s the radiator jacket became more the face of the 1930s cars. Most of the radiator jackets became chromed. Such a chromed radiator jacket looked more attractive and made the car more gloomier. But also other parts of the car, like parts of the wheel protection boards became chromed and also other ornamental strips. The car became to look more and more gloomier throughout the Thirties. The car became a symbol of new prosperity hopes during the depression of the 1930s. The aerodynamic vision also became an important part in designing 1930s cars throughout the Thirties. Aerodynamics and the streamlined design increased as well the volume of the automobiles engine. Streamlining a car also meant that more fuel, which already was cheap in the US, could be saved because of this streamlining.

istorically speaking, 1930 was not a very exciting year for Plymouth - or for anyone else in the automobile industry for that matter. 1929 had been a banner year, the best year ever in the industry's history to be exact, despite the fact that the stock market had crashed in October, plunging the world into the worst depression ever known by man. But the real effects of the Depression were just really starting to be felt. Plymouth entered the market with a car that can best be described as "confusing" - it was almost a totally new car, yet it was very much the same old car it had been in years past - Model 30U. It sat on a new frame, it had a completely revised engine, a new wide band radiator and most importantly, an all steel body; yet with the exception of the new radiator shell, it looked almost identical to the cars it was to replace. And as the model year continued, the car changed ever so slightly, in some cases incorporating items that were being developed for the totally new car that was to replace it, the Model PA. Production of the Model 30U enjoyed a 14 month production run, one of the longest in Plymouth's history. But its 1930s cars gave the company some staying power.

But on May 15, 1930, everything changed when Boeing Air Transport introduced the first female flight attendants. These women, called air stewardesses, attempted to make passengers more comfortable, offering them water, a sandwich, and sometimes chewing gum to help relieve ear discomfort.

Thus, nurses aboard the Boeing Model 80 became the first female flight attendants, for the salary of $125 per month. American Airlines began using stewardesses in 1933, and other airlines soon followed, although Pan American resisted the trend until 1944.

With the introduction of the Douglas DC-2 in 1934 and the DC-3 in 1936, air travel became much more comfortable and somewhat more commonplace. The DC-2 could fly coast-to-coast faster than any passenger plane before, and the DC-3 had both day and sleeper models, allowing passengers to travel cross-country in comfort. By 1939, at least 75 percent of all air travelers were flying on DC-3s. While the earlier trimotors had been plagued by engines that transmitted noise and vibration back to the passengers, Douglas planes added soundproofing to its cabins, ventilation ducts, and structure. Upholstered seats mounted on rubber and padded arm rests further reduced noise and vibration. The planes could also fly higher, around 20,000 feet, (6,100 meters), reducing, although not eliminating, turbulence, and the spar structure made the cabin roomier and easier to navigate than the contemporary Boeing 247, which had an internal spar that passengers had to step over.

1932 Ford V-8 Cabriolet

Disagreements also ensued over whether to have a co-pilot,

The major drawback of the Monomail was that its design was too advanced for the engines and propellers that were available. The airplane required a low-pitch propeller for takeoff and climb and a high-pitch propeller to cruise. By the time the variable-pitch propeller and more powerful engines were available, newer, multiengine planes were replacing it.

The co-pilot was added.

the plane was designed so that there would be sufficient propeller clearance if a variable-pitch propeller was added later.

The first 247 didn't fly until February 8, 1933, a year later than planned. It went into service with United on March 30, and most of the first 25 planes were delivered during April and May.

The modern twin-engine 247 demonstrated new aerodynamic qualities. It was a low-wing, all-metal monoplane with retractable landing gear and powered by two 550-horsepower (410-kilowatt) Pratt & Whitney Wasp radial engines. Lightweight alloys reduced its weight. It had enough power to climb on one engine with a full load, and it was also the first airliner to use wing flaps. Its final version, the 247D, had variable-pitch propellers and improved performance at higher altitudes to compete with the Douglas DC-2. It had room for 10 passengers, two pilots, and a stewardess (as flight attendants were then called), plus mail and baggage.