Hroth Posted January 23, 2016 Share Posted January 23, 2016 No, the actual tip or end of the flame is not the hottest. The cone is usually bright blue in colour, quite distinct from the rest of the flame, and the end of the cone, which is the hottest part of the flame, is approx a third of the way down the flame looking at it from the burner. Difficult to describe, but very easy and clear to see when you have the flame in front of you! When I did 'O' level Workshop Theory and Practice, one of the things we had to do was draw and annotate the structure of a gas flame for brazing and silver soldering. As you say, its very clear when its pointed out in a practical environment! I've still got the Engineers screwdriver I made back then; Mild steel hex bar handle turned and centre drilled on a 4" Boxford lathe with a silver steel shaft, silver soldered into the handle, the blade end case hardened after forming. Still in use after xx years..... Link to post Share on other sites More sharing options...
Talltim Posted January 23, 2016 Share Posted January 23, 2016 I made one like that, but with a turned wooden handle Link to post Share on other sites More sharing options...
davefrk Posted January 23, 2016 Share Posted January 23, 2016 Hooray, got my copy today in Hamilton, only two left now, still not got 243 but I will be renewing my subs so I don't miss any more. Dave Franks. Link to post Share on other sites More sharing options...
RMweb Premium Tim Dubya Posted January 25, 2016 RMweb Premium Share Posted January 25, 2016 Quote: "... if it's rural with a flange, I'm there". Me too mate!and that children, is how we breed in the west country!Top edition as always! Link to post Share on other sites More sharing options...
5050 Posted January 28, 2016 Share Posted January 28, 2016 No, the actual tip or end of the flame is not the hottest. The cone is usually bright blue in colour, quite distinct from the rest of the flame, and the end of the cone, which is the hottest part of the flame, is approx a third of the way down the flame looking at it from the burner. Difficult to describe, but very easy and clear to see when you have the flame in front of you! Seem to remember something similar to this from school days in the Chemistry Lab using Bunsen Burners. Haven't got a clue about the 'O' and 'A' level chemistry but the hottest part of a flame info' certainly stuck! Link to post Share on other sites More sharing options...
Rumblestripe Posted January 31, 2016 Share Posted January 31, 2016 From BBC revision pages! Nice issue, I just wish that some of those photos of Jerry's module/layout were bigger, the line of trees is masterful! Link to post Share on other sites More sharing options...
John_Hughes Posted February 5, 2016 Share Posted February 5, 2016 Just been re-reading Ian Smith's interesting article on building the Brunel baulk road in 2mm, and only now noticed that part of the point rodding extends way beyond the toe of the point, and then appears to terminate in the middle of the four-foot. Can anyone familiar with GWR practice in that period enlighten me as to why this is? Link to post Share on other sites More sharing options...
Talltim Posted February 8, 2016 Share Posted February 8, 2016 Was surprised that David Nicholson hasn't come across the Grandt Line and Tichy ranges of nut and bolt mouldings, would save him resin casting loads Link to post Share on other sites More sharing options...
Grovenor Posted February 8, 2016 Share Posted February 8, 2016 Just been re-reading Ian Smith's interesting article on building the Brunel baulk road in 2mm, and only now noticed that part of the point rodding extends way beyond the toe of the point, and then appears to terminate in the middle of the four-foot. Can anyone familiar with GWR practice in that period enlighten me as to why this is? The rod you are looking at is the one for the facing point lock which is driven via a lock bar located on the inside of the running rail, the photos are to small to see if the lock bar is modelled but you can see the facing point lock itself. Regards Link to post Share on other sites More sharing options...
John_Hughes Posted February 8, 2016 Share Posted February 8, 2016 The rod you are looking at is the one for the facing point lock which is driven via a lock bar located on the inside of the running rail, the photos are to small to see if the lock bar is modelled but you can see the facing point lock itself. Regards Ah, thanks! I'd wondered about a locking bar but I'd dismissed the idea because it seemed rather a long way from the toe of the point. But yes, it does make sense. Thanks again! Link to post Share on other sites More sharing options...
Ian Smith Posted March 21, 2016 Share Posted March 21, 2016 Just been re-reading Ian Smith's interesting article on building the Brunel baulk road in 2mm, and only now noticed that part of the point rodding extends way beyond the toe of the point, and then appears to terminate in the middle of the four-foot. Can anyone familiar with GWR practice in that period enlighten me as to why this is? The rod you are looking at is the one for the facing point lock which is driven via a lock bar located on the inside of the running rail, the photos are to small to see if the lock bar is modelled but you can see the facing point lock itself. Regards As Keith says, the rodding does extend to the lock bar. The lock bar is modelled in a rather rudimentary form as is the FPL detector - it is 2mm scale after all (and I've never seen either modelled in 2mm before) Not a particularly good image of the FPL and lock bar (which is why it didn't make it into the article) but best I have to hand : Regards, Ian Link to post Share on other sites More sharing options...
Krusty Posted March 22, 2016 Share Posted March 22, 2016 Going gaga in my old age, I'm still looking for the sources David Nicholson used to produce his viaduct drawings. On page 8 it says they're listed at the end of the article, so they must be there somewhere.... Link to post Share on other sites More sharing options...
dajt Posted April 4, 2016 Share Posted April 4, 2016 So 244 has finally made it to the outback, and it has S scale in it! Very pleased with what looks like a good mix of doing articles. Well done editor Link to post Share on other sites More sharing options...
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