Media business became big in the 1830s, partially due to the development of , which allowed for mass production of newspapers, books, and magazines.

The correct answer is the steam-powered printing press.

Explanation:

On November 28, but in 1814, a world steam press operated for the first time and went to edit the Times newspaper in London. The first was invented by German Frederick Koenig, but Willian Nicholson had developed rotary inking. Until the appearance of these inventions, the only existing machines were powered by the wind, water and muscles of men and animals.

Frederick Koenig, was born in 1744, in Leipzig (Germany). He, like Gutenberg, was obsessed with printing. He wanted to find a system that would allow more rapid printing and less work, but he also had no money and needed a capitalist partner to carry out his ideas.

Koenig's press was a steam printing machine. The shape remained on the stage, it moved thanks to the energy of the steam, made the sheet of paper I was printing, and then withdrew. This meant that the sheets of paper could be placed in place and removed without interruption.

Mechanical Presses

Explanation:

During the beginning of the 19th century, the first improvement to wooden hand press in nearly three half centuries was the emergence of iron hand press. All metal Stanhope press was then invented later in 1803 and used a couple of compound levers to create a bigger downward pressure. Then, printers started producing complete folio in one pull and thereby raising daily output.

A German whose name was Friedrich Koenig made a landmark achievement in the printing world in the year 1811 when he invented steam driven, flat - bed cylinder press which was capable of printing at more than five times, the speed of Stanhope.

After his invention, printers became able to produce more than one thousand sheets each hour. Then later in the year - 1830, the world began to use MECHANICAL PRESSES. and as a result, media businesses started becoming big due to the development of mechanical presses which helped greatly in mass production of newspapers/magazines/books.

answer; i believe that the correct answer is ; (a) customer demand for the

sound is invisible, but sometimes we can feel it. when a kettle-drum is thumped with a stick that time the tight drum skin moving up and down very quickly for some time and then it pumped sound waves into the air. loudspeakers also work in a similar manner.

components of a speaker:

electromagnet

in order to translate an electrical signal into an audible sound, an electromagnet is used in looudspeakers

  suspension

suspension is used to   center the voice coil in the gap of the magnet and it exerts a restoring force to keep it there. suspension is used to limits the maximum mechanical excursion of the diaphragm and voice coil.

voice coil

voice coil is a coil of wire which is attached to the apex of a loudspeaker cone. it provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.

cone

in a   loudspeaker, a   thin, semi-rigid membrane attached to the voice coil, which moves in a magnetic gap due to which it vibrates   and produced sound. it is known as diaphragm and it can also be called a cone, though not all speaker diaphragms are cone-shaped.

surround

surround is also known as front suspension. surround is used to join the cone to the chassis. together with the suspension it controls the cone excursion, and it is also used to   determine how energy which is   travelling through the cone is absorbed, and how the speaker limits when it reaches the ends of its travel.

dustcap

dustcap is used to protect the voice coil from dust and dirt. it is a part of the cone.

how speaker work

the outer part of the cone is fastened to the outer part of the loudspeaker's circular metal rim. the inner part is fixed to   voice coil that sits just in front of a permanent magnet . when loudspeaker is hooked up to a stereo, electrical signals feed through the speaker cables into the coil. it will convert the coil into an electromagnet magnet . when electricity flows back and forth in the cables, the electromagnet either repels or attract the permanent magnet. this moves the coil back and forth, and it pull and push the loudspeaker cone. like a drum skin vibrating back and forth, the moving cone pumps sounds out into the air.in this way loudspeakers works.