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So the radio receiving equipment of the time did not have to convert the radio waves into sound like modern receivers, but merely detect the presence or absence of the radio signal. The device that did this was called a detector. The first widely used detector was the coherer, invented in 1890. The coherer was a very poor detector, insensitive ...
It was a 4-coil induction balance for detecting submerged metallic torpedoes and iron ships and the like. [8] Given the development time involved this may have been the earliest known device specifically constructed as a metal detector using magnetic induction.
This is a list of historically significant items found by metal detecting method, only excluding magnet fishing finds, since magnet fishing is usually considered a distinctively different and separate hobby from traditional metal detecting.
According to ghost hunters these are helpful in detecting and visualizing temperature changes during an investigation. SLS or Kinect camera This is a device that uses a pattern of infrared dots to detect objects in complete darkness. Analyzed by Kenny Biddle [56] [57] and found prone to spurious results when used as a non-stationary device.
A Russian mnemonic is that the waxing moon is right part of letter 'Р', which is the first letter of word растущая (growing), and the waning moon looks like 'C' which is first letter of the word стареющая (getting old). A Norwegian mnemonic is "When it looks like a comma, it's coming!"
A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
Single sensors may detect overall light levels. A 1-D array of photodetectors, as in a spectrophotometer or a Line scanner , may be used to measure the distribution of light along a line. A 2-D array of photodetectors may be used as an image sensor to form images from the pattern of light before it.
The player must rotate their device to read certain lines of text as they navigate through the game world. Device 6 uses mainly text in its gameplay, and the player swipes the screen to move through or review the story. [4] The text may turn or split into branches in certain points of the game, adapting to the protagonist's movements in the ...