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Theremontor
Thermometers measure temperature, by using materials that change in some way when they are heated or cooled. In a mercury or alcohol thermometer the liquid expands as it is heated and contracts when it is cooled, so the length of the liquid column is longer or shorter depending on the temperature. Modern thermometers are calibrated in standard temperature units such as Fahrenheit (used in the United States) or Celsius (used in Canada) and Kelvin (used mostly by scientists). -
Franklin stove
The Franklin stove is a metal-lined fireplace named after its inventor, Benjamin Franklin. It was invented in 1741.[1] It had a hollow baffle near the rear (to transfer more heat from the fire to a room's air) and relied on an "inverted siphon" to draw the fire's hot fumes around the baffle.[2] It was intended to produce more heat and less smoke than an ordinary open fireplace. It is also known as a "circulating stove" or the "Pennsylvania fireplace". -
Diffeerence engine
A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. The name derives from the method of divided differences, a way to interpolate or tabulate functions by using a small set of polynomial coefficients. Both logarithmic and trigonometric functions, functions commonly used by both navigators and scientists, can be approximated by polynomials, so a difference engine can compute many useful sets of numbers. -
first mechanical computer
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Photogarphy invented
Photography is the art, science, and practice of creating durable images by recording light or other electromagnetic radiation, either chemically by means of a light-sensitive material such as photographic film, or electronically by means of an image sensor.Typically, a lens is used to focus the light reflected or emitted from objects into a real image on the light-sensitive surface inside a camera during a timed exposure. -
first typewritter
It was called the "Sholes & Glidden Type Writer," and it was produced by the gunmakers E. Remington & Sons in Ilion, NY from 1874-1878. It was not a great success (not more than 5,000 were sold), but it founded a worldwide industry, and it brought mechanization to dreary, time-consuming office work. The idea began at Kleinsteuber's Machine Shop in Milwaukee, Wisconsin in the year 1868. A local publisher-politician-philosopher named Christopher Latham Sholes spent hours at Kleinstuber's. -
raido waves were invented
James Clerk Maxwell showed mathematically that electromagnetic waves could propagate through free space. Heinrich Rudolf Hertz and many others demonstrated radio wave propagation on a laboratory scale. Nikola Tesla experimentally demonstrated the transmission and radiation of radio frequency energy in 1892 and 1893 proposing that it might be used for the telecommunication of information. The Tesla method was described in New York in 1897. In 1897, Tesla applied for two key Unite -
radio amp
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Konrad Zuse's Z1 Circa
Konrad Zuse 1910–1995) was a German civil engineer, inventor and computer pioneer. His greatest achievement was the world's first functional program-controlled Turing-complete computer, the Z3, which became operational in May 1941. -
tv electronic
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computer mouse invented
In computing, a mouse is a pointing device that functions by detecting two-dimensional motion relative to its supporting surface. Physically, a mouse consists of an object held under one of the user's hands, with one or more buttons. The mouse sometimes features other elements, such as "wheels", which allow the user to perform various system-dependent operations, or extra buttons or features that can add more control or dimensional input. The mouse's motion typically translates into the motion -
first viedo
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email invented
Computer engineer, Ray Tomlinson invented internet based email in late 1971. Under ARPAnet several major innovations occurred: email (or electronic mail), the ability to send simple messages to another person across the network (1971). Ray Tomlinson worked as a computer engineer for Bolt Beranek and Newman (BBN), the company hired by the United States Defense Department to build the first Internet in 1968.
