Magnet coil cores, demagnetization power and Lenz delay.

[TinselKoala]

And yet... a good fast risetime pulse generator from last century uses a mercury-wetted reed switch to generate the nanosecond-risetime pulses.
For example the Tektronix Type 109, with a risetime of 250 picoseconds, using just such a switch:

http://www.ivorcatt.co.uk/x212.pdf

[MarkE]

And yet... a good fast risetime pulse generator from last century uses a mercury-wetted reed switch to generate the nanosecond-risetime pulses.
For example the Tektronix Type 109, with a risetime of 250 picoseconds, using just such a switch:

http://www.ivorcatt.co.uk/x212.pdf

Mercury-wetted contacts are in a completely different class than ordinary reeds.  Fifty years ago when the 109 was designed power MOSFETs did not exist.  The memory in your desktop or laptop computer has much faster rise and fall times:  ~70ps - 100ps than the 109's 250ps.  Fast current generation TDR's offer pulse rise times under 10ps.

[TinselKoala]

Yep, and those old mercury-wetted reed switches are costly too, if you can find them. I think the for the last 109 I repaired, the NOS reed switch cost something over 100 dollars.

[synchro1]

The trouble there is that the transit velocity is constant (let's not get picky about humidity and air pressure over time) and the distance is constant leading to a constant delay between any event and the observer.  There is not any distance you can locate the observer where the receive free energy due to their position.

Here's a great video on the Wesley Gary effect proving you wrong:

https://www.youtube.com/watch?v=ACykTfXspfM&index=7&list=FL3v-1RhhS50L5H2_FYFFBqQ

The Reed Relay comes in multiple designs, some with slider points and springs. The industrial current reversing variety is designed to very high tolerance. The transistor requires a power source and eats juice.

[synchro1]

A tiny relay coil at the back of the magnet stack would allow for re-positioning to the neutral zone without physically moving the coil. Reducing the power to the tiny backing coil would have the same effect as moving the entire coil away from the rotor. Fine tuning can be accomplished this way for "Lenz Propulsion" output. Mark maintains this is a zero sum approach. My experiments prove there's net gain.

Four magnet core GAP coils and a two pole rotor would deliver the same power as well as extend the demagnetization interval as kEhYo's version.