the vacuums go back to the mid 1800s but they became electric in 1910 for the vacuum cleaner , 1931 for the Electric Guitar.
* == 1st generation vacuum tube look like as a parallel electric bulb. _____ ----_____)
Radio waves vibrate the impedqnce or ether of free space. The space or ether impedance is the ratio of the magnetic charge W-500 e-18 webers(volt seconds) and the electric charge C=4/3 e-18 Coulombs. z=W/C= 500x3/4=375 Ohms! The vibratioon of the ether propagates the electric wave.
A centrifugal electric blower is installed in the lower portion of the piano cabinet. Attached to the player action, it creates the same vacuum to operate the player that you do when you pump the pedals with your feet. The blowers installed by Rechel Piano Company, incorporate a volume control, a rewind speed reduction, and a one way valve to allow the piano to still be pumped by foot. Pumping it by foot was the original way to power a player piano.
Take a vacuum hose off at the intake manifold and put a vacuum gauge on the port, then read the vacuum with the engine running.
electronic vacuum gauge
James Murray Spangler invented the first motorized, portable vacuum cleaner. Spangler was a janitor in Ohio and used an electric fan, a box, and one of his wife's pillowcases.
The baby company
it is educational methods and theories
Use an antique hand pumped vacuum cleaner (they existed before the electric ones).
portable electric vacuum cleaner
Ives W. McGaffney, of Chicago, created a mechanical machine in 1868.Hubert Cecil Booth, an English engineer, built an electric vacuum cleaner in 1901.Daniel Hess invented the vacuum cleaner in 1860.thomas EdisonOtto Von GuerickeDavid Hess did.Ives McGaffeyIves McGaffey
On 8 June 1869, Ives McGaffey patented a "sweeping machine" which was the first invention to clean rugs. On 30 August 1901, British engineer Hubert Booth patented an invention he called the vacuum cleaner. In 1907, American James Spangler invented the first portable electric vacuum cleaner.
James Dyson Invented the Dyson Vacuum Cleaner
Not as quick, but then it frees time up for the would be human cleaner. Quality is not a big difference.
Daniel Hess of West Union, Iowa (USA) invented a vacuum cleaner in 1860.
Although it is called a vacuum cleaner, it does not actually create a vacuum. Inside the cleaner there is an electric motor which drives a fan blade. This fan blows air out of the vacuum cleaner and this causes air to be drawn in to the cleaner at the other end. Thus the cleaner works by creating an air flow, not a vacuum.
J.Murray Spangler was the inventor of vacuum cleaner with bag