We considered the pentagonal numbers which begin : That is : for Now consider the following sequence : which begins at and has a common difference of between the terms. For any arithmetic sequence, we [more…]
At some point in the 1980s a certain Bob Boyd needed to use a lavatory. I suppose that we all do, from time-to-time. And, at some point in the 1800s, someone decided it a very [more…]
Introduction Sometime in mid-2017 I casually remarked to the chap shooting at the next bench to me that I had long been fascinated by the Westley Richards ‘Monkey Tail’ transitional rifle but had never actually [more…]
I would not say that I am afraid of science and technology but I do make an exception in certain areas: nuclear physics being one example. Firstly, it’s very dangerous to play with (duh!). Secondly, [more…]
Introduction By inducing a projectile to spin around its own axis its flight is stabilised and accuracy and range are vastly improved. Rifling a barrel by cutting spiral grooves in a variety of forms and [more…]
I worked for Sweda Litton designing a POS (Point Of Sale) system for Boots The Chemists. The relevance for my future computing work is that I invented a table driven methodology for controlling POS terminals. [more…]
Introduction Every month my gun club holds a guest day when members can bring along friends and family to ‘have a go’ with their firearms. Maybe it’s because we were raised on a diet of [more…]
Hypsicles of Alexandria (c.190 – c.120 B.C.) gave the following definition of polygonal numbers : If there are as many numbers as we please beginning from 1 and increasing by the same common difference, then, [more…]
Introduction Although the flintlock ignition system was technically advanced for its time, it wasn’t without its shortcomings. Flintlocks require careful setting-up and constant maintenance and adjustment to be reliable. They also have a relatively slow [more…]
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