It all begun with liquid transmitter, which was the first transmitter developed by Alexander Graham Bell and Elisha Gray almost simultaneously, in 1876. And that later came to be known as liquid microphones. This transmitter had a diaphragm attached to a funnel shaped mouthpiece. There was a metal pin at the center of the diaphragm, [...]
For many years I have been very interested in one special musical instrument: the French horn. If you have never heard a French horn, well this intriguing brass instrument with a mellow tone. There are not small instrument. A normal French horn will be 12 feet of tubing and it is part of the bass [...]
