18th Century
Holding Hands – Part Two
In Part One, I explained that my husband and I travelled to Moelfre, not far from Oswestry, to see a sculptor by the name of Tony Meadows. During that visit, Tony had made an alginate [more…]
19th Century
19th Century
Divided Nation
There are many similarities between family life and the life of the nation. Peace in the home tends to come through being united around common values and expectations. The presence of harmony within the walls [more…]
18th Century
Sophie Germain Primes and Cunningham Chains
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
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
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
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
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…]
19th Century
Holography, Part Two
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…]
19th Century
Holography, Part One
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…]