Sholes and Glidden typewriter seeking to diversify, Remington further refined the typewriter before finally placing it on the market on July 1, 1874. During its development, the typewriter evolved from a crude curiosity into a practical device, the basic form of which became the industry standard. The machine incorporated elements which became fundamental to typewriter design, including a cylindrical platen and a four-rowed QWERTY keyboard. Several design deficiencies remained, however. The Sholes and Glidden could print only upper-case letters—an issue remedied in its successor, the Remington No. 2—and was a "blind writer", meaning the typist could not see what was being written as it
Cylindrical drum of Greece. Cylindrical drum Cylindrical drums are a category of drum instruments that include a wide range of implementations, including the bass drum and the Iranian "dohol". Cylindrical drums are generally two-headed and straight-sided, and sometimes use a buzzing, percussive string. The Iranian "dohol" is a famous form of cylindrical drum. Many music areas nears in the Middle East, North Africa and Central Asia include variations on the dohol and cylindrical drum forms, including the "dhol" of Armenia, "daval" of Kurdistan and the "tabl ballady" of Egypt. Southeastern Europe is home to cylindrical drums like the "tapan" of Macedonia and