Experimental Modern and Quantum Physics for Do-It-Yourself Science Enthusiasts 

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diy Measurement of the Charge-to-Mass Ratio of the Electron Using “Magic Eye” Tube – Supplementary Pictures

Figure 54 in the book shows our setup based on a 6AF6-G “magic eye” tuning tube to measure e/m.  The pictures in this figure supplement the book’s Figure 54 to help you build your own system.   In the 6AF6, electrons produced by a thermionic cathode cause fluorescence on the tube’s anode. Applying an external magnetic field curves

 
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d.i.y. Measurement of Electron’s Charge-to-Mass Ratio Through Hoag’s Method – Supplemental Pictures

Figures 51 and 52 in the book show how to use an oscilloscope 2AP1 CRT to measure e/m using Hoag’s method.  The pictures in this figure supplement the book’s, showing you how to construct the d.i.y. setup, as well as the way in which the electron beam fan is reduced to a point as the magnetic

 
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d.i.y. Maltese Cross Cathode Ray Tube – Supplementary Picture

This is a supplementary picture to the book’s Figure 43.  It shows our d.i.y. “Maltese Cross” CRT connected to the vacuum system and high-voltage power supply.  Please note that the HV power supply is configured to produce a negative output referenced to ground.  The anode and target electrode are at ground potential.  The cathode rod

 
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