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catboat

n.
1.a sailboat with a single mast set far forward

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  • Idiom of the Day

    make a point
    to state something important
    The speaker used some examples to make a point during his speech.



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    I just love your jacket!

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  • Science Experiments Ideas

    Electro buzzer

    Nail board B and wooden blocks C and D onto board A about 5 x 5 inches. Push an iron bolt through a hole bored in B. Wind covered copper wire G 100 times round the bolt and connects the ends to a battery and to H respectively. Bore a hole through block C and wedge the fret saw blade H firmly into it so that its end is a short distance from bolt F. Hammer a long nail K through A and bend it so that its point rests in the middle of the saw blade. Oil the point of the nail. Use a piece of beading E as a key, with a rubber band P as spring and drawing pins M and N as contacts. Join all the parts with connecting wire remove the insulation.
    If you press the key down, you connect the electric circuit, bolt F becomes magnetic and attracts. At this moment the circuit is broken at K and the bolt loses its magnetism. H jumps back and reconnects the current. This process is repeated so quickly that the saw blade vibrates and produces a loud buzz. If you wish to do Morse signalling with two pieces of apparatus, you must use three leads as in the lower circuit diagram.


    Chourishi Systems