scince, logic

[downbeatplumb]

marconi used.

A relatively simple oscillator, or spark-producing radio transmitter, which was closely modeled after one designed by Righi, in turn similar to what Hertz had used;
A wire or capacity area placed at a height above the ground;
A coherer receiver, which was a modification of Edouard Branly's original device, with refinements to increase sensitivity and reliability;
A telegraph key to operate the transmitter to send short and long pulses, corresponding to the dots-and-dashes of Morse code; and
A telegraph register, activated by the coherer, which recorded the received Morse code dots and dashes onto a roll of paper tape.
Similar configurations using spark-gap transmitters plus coherer-receivers had been tried by others, but many were unable to achieve transmission ranges of more than a few hundred metres.

Marconi, just twenty years old, began his first experiments working on his own with the help of his butler Mignani. In the summer of 1894, he built a storm alarm made up of a battery, a coherer, and an electric bell, which went off if there was lightning. Soon after he was able to make a bell ring on the other side of the room by pushing a telegraphic button on a bench.[10][citation needed] One night in December, Guglielmo woke his mother up and invited her into his secret workshop and showed her the experiment he had created. The next day he also showed his father, who, when he was certain there were no wires, gave his son all of the money he had in his wallet so Guglielmo could buy more materials. In the summer of 1895 he moved his experimentation outdoors. After increasing the length of the transmitter and receiver antennas, and arranging them vertically, and positioning the antenna so that it touched the ground, the range increased significantly.[11][12] Soon he was able to transmit signals over a hill, a distance of approximately 2.4 kilometres (1.5 mi).[13] By this point he concluded that with additional funding and research, a device could become capable of spanning greater distances and would prove valuable both commercially and militarily.

It seems people had been working on wireless telegraphs for almost 50 years when marconi made his breakthrough.

What is the point of this thread?

and dont you have access to wikipedia?