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A trumpet is a musical instrument. It is the highest register in the brass family. Trumpets are among the oldest musical instruments, dating back to at least 1500 BC. They are played by blowing air through closed lips, producing a «buzzing» sound that starts a standing wave vibration in the air column inside the instrument. Since the late 15th century they have primarily been constructed of brass tubing, usually bent twice into a rounded oblong shape. There are several types of trumpet. The most common is a transposing instrument pitched in B♭ with a tubing length of about 148 cm. … Continued
The invention of the camera in the early 19th century has led to a large array of lens designs intended for photography. The problems of photographic lens design, creating a lens for a task that would cover a large flat image plane, were well known even before the invention of photography due to the development of lenses to work with the focal plane of the camera obscura, a device for projecting images used as a novelty and an artist’s drawing aid that had been around for hundreds of years. Since the invention of photography many types of lenses have been … Continued