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19th Century

OldTrout, Going Postal
18th Century

Sophie Germain Primes and Cunningham Chains

28th September 2020 OldTrout 2231 Comments

A Sophie Germain prime is a prime number such that is also a prime number. That is, ,  where and are both prime.  For example, . The sequence begins Sophie Germain () explored these primes [more…]

16th Century

The Troubled History of the Potato

17th September 2020 Tachybaptus 2443 Comments

The potato is a native of the high Andes, a low-growing plant (Solanum tuberosum) with pretty purple flowers and round black fruits. To survive in its harsh environment it has evolved the habit of growing [more…]

18th Century

How the 1st Duke of Wellington dealt with civil and other serpents

11th September 2020 Going Postal 3716 Comments

You asked for it, dear Puffins! So here it is: another piece on one of my favourite subjects, the 1st D of W – this time about how he dealt with civil and other serpents. [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 2994 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…]

19th Century

I never meant to write a novel

28th July 2020 Tachybaptus 3524 Comments

Today A Bear’s Diary is published as a hardback. It has been available as an ebook for a couple of months. It’s a shortish novel at 65,000 words, decorated with old engravings which give it [more…]

19th Century

The Battle of Salamanca

22nd July 2020 Going Postal 3313 Comments

As any Puffin knows, I’m a card-carrying member of the ‘First Duke of Wellington Fan Club’. No, not because of his good looks, how very dare you! He’s dead, he is, more’s the pity – [more…]

Posts pagination

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  • The Past is Present, Chapter One

    12th April 2025 1737 Comments
    Dave and Sally walked to their hotel, his arm was round her, they were both happy and laughing. The sound of cicadas could be heard in the undergrowth. It was now over eighteen months since [more...]
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    After watching events over the last week – there is a case of doing away with voting and going straight to red-hot pokers. However, as a better people, we will endure to change the system [more...]
  • Crossword No. 79

    17th August 2019 3314 Comments
    First correct entry out of ‘the hat’ wins a GP mug of your choice, or GP beer mats. Email entries to me by 6.00 pm tomorrow subject ‘Crossword’. Contact here on email Last weeks’ winners. [more...]
  • Roger Ackroyd’s Question Time Review

    8th November 2019 2091 Comments
    Question Time 7th November 2019 Panel: Barry “Uphill” Gardiner (Wind the bugger up and set the snooze button to zzzzzzz) Kirstene Hair (Tory who admits she didn’t vote in the referendum)) Humza Yousaf (SNP Scottish [more...]
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    29th July 2024 3111 Comments
    First an apology. I was going to insert photos into this piece, but the ones I took were rubbish and not wishing to compromise SB’s site with unauthorised clips I gave up with the visuals. [more...]

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