![]() ![]() 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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