Читать книгу Bicycling for Ladies. The Common Sense of Bicycling; with Hints as to the Art of Wheeling—Advice to Beginners—Dress—Care of the Bicycle—Mechanics—Training—Exercise, etc., etc онлайн

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We have, therefore, a wheel which supports a frame and the weight it carries. The frame is supported on two wheels, one end of the frame taking the weight, and that end supported on one wheel. The second wheel merely supports one end of the frame. If the frame were attached at one end directly and rigidly to the second wheel, the weight carrying wheel would move in the same plane with it. A child’s two-wheeled cart will illustrate this. While moving forward in a straight line, the child is safe until one or both of the wheels begin to travel in a rut, when the rigid handle or tongue of the cart resists the guiding power, and the child is pulled or thrown over. If the tongue or frame of the wagon is allowed play, as it is called, say by being held easily in the hand, the pole may be guided. The supported end of the frame of the bicycle corresponds to the pole or tongue of the cart.

Now, the wheel is made to steer in this way: We have the rigid forks, and a wheel to support them. The forks hold the wheel in the same plane as themselves, but the top part of each fork, instead of being fastened immovably to the frame, passes up through a bearing-head prepared for it in the frame. The wheel is supported, but it can now maintain a separate plane, and as the post of the forks changes its direction, it pulls the frame with it as it advances; and so the controlling or steering power is transferred.