Talk:  Keeping our Feet Dry - A Potted History of Land Drainage

By Roger Backhouse

Roger is a well-known member of SMEE, who has given several entertaining and informative talks to the Society. In this one he will look at the long history of land drainage by machine including how the English learned from advanced Dutch technology, what is a polder and how to drain one, the biggest cylinder in the world in Europe’s most unusual steam engine. why a cast iron post is important, and what happened to England’s largest lowland lake. He will describe how the landscape was transformed by drainage and how land drainage is now being rethought in the light of environmental concerns.

The main speaker will be Allen Berman who will talk about the Bradley Engine in the SMEE collection which he restored in 2017 and is now on display in the SMEE Marshall House Library. The work was carried out in his home workshop and the result displayed at Ally Pally in Jan 2018. Roger Backhouse wrote an article for MEW based on the conservation and Allen has pictures of the internals of the engine and also a short video of it running.  Ian Bradley was a well-known model engineer; he and Norman Hallows wrote a number of books and articles on model engineering topics under the pseudonym ‘Duplex’.  

In addition, Charles is hoping to present a ‘Snippet’ on the manufacture of Fish-Bellied Con-Rods which should lead to an interesting discussion. If you have experiences or ideas about this topic, please do contribute.

The meeting will follow the usual format and is planned for 2 hours:

1. Chairman’s Introduction and Updates
2. Main speaker followed by questions and discussion#
3. Snippets
4. Work on the Table
5. Closing comments

If you would like to join the meeting please contact the group for a Zoom invitation.

Talk:  3D printing - ready for close up

Adrian Johnstone

A new breed of low cost, high precision 3D printers has become available over the last three years including filament extrusion printers capable of 5 thou layer heights and resin printers accurate to 2 thou, at prices in the £200-£350 pound level.  In his talk Adrian will outline the core 3D printing technologies (both commercial and hobbyist), explain how these new hobbyist printers have achieved these higher levels of accuracy and repeatability, and discuss commercial services that provide cheap-ish access to professional grade printing.  He will also talk about the CAD software learning curve which for many people presents a formidable obstacle to using these tools. In response to this problem, G1MRA has launched an initiative to create and publish 3D models of railway items that can be scaled intelligently and printed without needing to use CAD design software.  He will show examples of prints made using different technologies, including railway wagons which rival the quality of commercial items but  only cost a few pounds to make.

Adrian is a member of  SMEE and a founding member of the Computer Conservation Society.  He works with museums and academics in the History of Science on computing history. He is also Chair of the G1MRA Surrey Local Area Group, and runs a 'virtual' G1MRA group called the Gauge One 3D Circle, which exists to share expertise in all forms of CAD/CAM as applied to Gauge 1 modelling, and aims to create a series of freely available high quality parameterised 3D models of Gauge 1 items.

The Annual General Meeting will be held via Zoom.  Since it is expected to be shorter than usual because of the absence of Competition presentations, it will be followed by a general "chat" and "show-and-tell;" session.