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Articles by Doc Mike Finnley

Physics

Three Gyroscopes – Part 2

20th December 2021 Doc Mike Finnley 3656 Comments

Introduction The “flat earth” people like to disseminate their woeful ideas. Therefore, let us spend some little time to think about the earth that we all live upon. In particular its spherical (well, almost) shape [more…]

Physics

Three Gyroscopes – Part 1

13th December 2021 Doc Mike Finnley 3959 Comments

Introduction I woke up one morning thinking, “I’ll write a few articles for GP about the gyroscope. How hard can that be?”. Hmm… Well it turns out that that was a really stupid idea. Are [more…]

Computing

A Simple R6G Dye Laser – Part 3

28th July 2021 Doc Mike Finnley 2774 Comments

If you’ve been following along (well done you!) then you might recall that we need a fast switch that works at a very high voltage for the laser’s pump lamp and, indeed, for the laser [more…]

Computing

A Simple R6G Dye Laser – Part 2

21st July 2021 Doc Mike Finnley 3640 Comments

Lamp Light And Laser Light Pulsed lasers, like this, use an intense burst of white light (lasting fractions of a second) to stimulate the electrons in the laser’s gain medium. In the above photo you [more…]

Computing

A Simple R6G Dye Laser – Part 1

14th July 2021 Doc Mike Finnley 3592 Comments

Introduction First of all, it’s great to see that Going-Postal is still up and running. It’s always a pleasure to write an article and have it published here. It’s also good to see a lot [more…]

19th Century

Holography, Part Four

9th September 2020 Doc Mike Finnley 5304 Comments

Holograph Examples The PFG-01 holographic film that I’ve used in the examples below is ideally suited to making transmission holograms but it can also be used to make reflection holograms. Reflection Holograms One of the [more…]

19th Century

Holography, Part Three

2nd September 2020 Doc Mike Finnley 2998 Comments

A Simple Dual Beam Setup We’ve got our film, developer and a safety lamp. Now we need a holographic camera. Well, not exactly a camera. You can’t take a picture of rolling hills or a [more…]

Doc Mike Finnley, Going Postal
19th Century

Holography, Part Two

26th August 2020 Doc Mike Finnley 3647 Comments

A Holographic Camera Standard photography uses a lens system to focus an image onto a film or an electronic sensor. If you recall from part one, Dennis Gabor had a problem with his electron microscope’s [more…]

Doc Mike Finnley, Going Postal
19th Century

Holography, Part One

19th August 2020 Doc Mike Finnley 3209 Comments

Introduction To the Looking-Glass world it was Alice that said, “I’ve a sceptre in hand, I’ve a crown on my head. Let the Looking-Glass creatures, whatever they be Come dine with the Red Queen, the [more…]

Posts pagination

« 1 2 3 4 »

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  • Confronting The Climate Emergency – Part 4

    13th August 2019 3905 Comments
    Some Interesting facts: Carbon Dioxide is a trace gas and currently accounts for approximately 405ppm (parts per million) or approx. 0.04% of the earth’s atmosphere. 200 years ago in 1820, it is estimated (ice core [more...]
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