Rub your dry finger around the rim of the glass while pressing down gently.Hold down the base of the glass with your non-dominant hand.Take an empty wine glass and put it in front of you on the table.Wash your hands with dish soap and rinse your hands thoroughly.Carefully gather your wine glass(es) and your measuring cup, as well as some water.Find a working area that can tolerate some water spills.Piano or keyboard for comparing notes (optional).Chromatic tuner (optional, available as free phone app).Wine glasses and permission to use them carefully (optional: different size and shapes).Now let's make some music and you can play your very own wine glass instrument. The resonant frequency of wine glasses is typically within the range of human hearing (20-20,000 Hz), and this is why you hear the resulting resonant vibration as a tone. There is a particular frequency, called the resonant frequency, at which the sides of the glass will vibrate most easily. The frequency specifies the rate at which a vibration occurs and is usually measured per second or Hertz (Hz). The sides of the glass transmit the vibration to the surrounding air, creating a sound wave with a specific frequency. When the pressure and amount of moisture are just right, this so-called stick-slip motion (the slight friction between your finger and the rim of the glass) will cause vibrations in the sides of the glass. The water on your finger, however, will allow your finger to slip, as it forms a cushion that reduces friction. When you rub your moistened finger along the rim of the glass, your finger will stick to the glass as it encounters resistance, or friction, when it moves over the glass surface. Both of these instruments are based on the principle of generating musical tones by means of friction. About 10 years later, Benjamin Franklin-one of the founding fathers of the United States-invented a mechanical version of the glass harp, called the glass harmonica. The first musical instrument made of upright wine glasses was called the glass harp and was invented around 1750. Glasses have been used for making music since the Middle Ages. But did you know that you can make wine glasses sing? Perhaps you have done this many times before, but have you ever wondered why the wine glass makes this sound? Do this activity, and you will not only make wine glasses sing, but you will also learn how to generate different notes you might even get inspired to play a little song. The table is full of delicious food-a big feast-and there might even be some fancy dishes and glassware on the table to make the celebration even more special. Thanksgiving can be a wonderful time of year, with friends and family getting together.
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