If you like us, please share us on social media.
The latest UCD Hyperlibrary newsletter is now complete, check it out.
Copyright (c) 2006-2014 MindTouch Inc.
This file and accompanying files are licensed under the MindTouch Master Subscription Agreement (MSA).
At any time, you shall not, directly or indirectly: (i) sublicense, resell, rent, lease, distribute, market, commercialize or otherwise transfer rights or usage to: (a) the Software, (b) any modified version or derivative work of the Software created by you or for you, or (c) MindTouch Open Source (which includes all non-supported versions of MindTouch-developed software), for any purpose including timesharing or service bureau purposes; (ii) remove or alter any copyright, trademark or proprietary notice in the Software; (iii) transfer, use or export the Software in violation of any applicable laws or regulations of any government or governmental agency; (iv) use or run on any of your hardware, or have deployed for use, any production version of MindTouch Open Source; (v) use any of the Support Services, Error corrections, Updates or Upgrades, for the MindTouch Open Source software or for any Server for which Support Services are not then purchased as provided hereunder; or (vi) reverse engineer, decompile or modify any encrypted or encoded portion of the Software.
A complete copy of the MSA is available at http://www.mindtouch.com/msa
|One end of a Crookes' tube is touched with a Tesla coil. |
A horseshoe magnet is brought near the tube.
Alternatively, the tube could also be connected to a vacuum pump.
The tube emits a glow in a straight line until the magnet is brought near. The magnet deflects the glow into a bent line.
Cathode "rays" are actually streams of negatively charged particles (i.e. electrons).
Cathode-ray tubes contain a pair of metal plates sealed into a glass tube that has been at least partially evacuated. If the residual pressure of the gas is small enough, the glass at the end of the tube across from the cathode will glow when the tube is connected to a series of batteries. The rays given off by the cathode can be deflected by a magnetic field in a direction which suggests that these cathode rays are negatively charged. A solid object placed in the path of the cathode rays casts a shadow on the wall of the tube across from the cathode. The cathode rays also can be deflected by an electric field in a direction which suggests they are negatively charged.
An NSF funded Project