RMweb Premium Compound2632 Posted July 25, 2019 RMweb Premium Share Posted July 25, 2019 (edited) 30 minutes ago, kevinlms said: Presumably the major ingredient is listed first, then in descending order? Methyl ethyl ketone is an alternative name for the molecule whose official IUPAC name is butan-2-one. Ketone indicates that it contains an oxygen atom bonded to a carbon atom (C=O); methyl denotes that an methyl group (-CH2) is bonded to that carbon; ethyl, that an ethyl group (-CH2CH3) is also bonded to that carbon. As far as I can see, the order in which the components groups are listed is dictated by convention not structure. The IUPAC name, rather than building the molecule up from these groups, Lego-like, takes a more wholistic view: it's a butane molecule (CH3CH2CH2CH3) with the hydrogen atoms attached to the second carbon along replaced by a single oxgyen atom (-one). Edited July 25, 2019 by Compound2632 2 Link to post Share on other sites More sharing options...
RMweb Premium John Isherwood Posted July 25, 2019 RMweb Premium Share Posted July 25, 2019 1 hour ago, Compound2632 said: Methyl ethyl ketone is an alternative name for the molecule whose official IUPAC name is butan-2-one. Ketone indicates that it contains an oxygen atom bonded to a carbon atom (C=O); methyl denotes that an methyl group (-CH2) is bonded to that carbon; ethyl, that an ethyl group (-CH2CH3) is also bonded to that carbon. As far as I can see, the order in which the components groups are listed is dictated by convention not structure. The IUPAC name, rather than building the molecule up from these groups, Lego-like, takes a more wholistic view: it's a butane molecule (CH3CH2CH2CH3) with the hydrogen atoms attached to the second carbon along replaced by a single oxgyen atom (-one). It all sounded like Chinese in O-level chemistry, and it still does fifty-five years later !! Regards, John Isherwood. 1 2 1 Link to post Share on other sites More sharing options...
RMweb Premium Compound2632 Posted July 25, 2019 RMweb Premium Share Posted July 25, 2019 7 minutes ago, cctransuk said: It all sounded like Chinese in O-level chemistry, and it still does fifty-five years later !! And so it should - chemical nomenclature is an internally self-consistent symbolic language. The rudiments are taught at A-level, I believe. 1 Link to post Share on other sites More sharing options...
RMweb Premium Nile Posted July 25, 2019 RMweb Premium Share Posted July 25, 2019 I've found an old bottle of Daywat liquid polly,on the label is 2.Butanone. I've also found an old bottle of Slaters MEK-PAK, the label says it contains Trichloroethane. It also says it does not contain any MEK (Butanone), MEK-PAK is a trade name. I now use MEK, which I don't refer to as MEK-PAK to avoid confusion. 1 Link to post Share on other sites More sharing options...
Graham456 Posted November 13, 2020 Share Posted November 13, 2020 (edited) On 11/07/2019 at 20:49, Graham456 said: On my to do pile are two 2-4-0 kits and one 4-4-0 , both have the later part brass chassis and I have a perseverance chassis for the other, Romford wheels to replace ones supplied await use.djh sixty to one gearboxes, and stashed away Little mashimas ready to go , no molded on handrails to be seen missing ingredient?.............time Up date thanks to my B & B being closed down this year that missing ingredient has turned up ! both kits are nearly finished chassis built ( one preseverance one brass overlays) Romford fitted yes that's Romford pre markits romfords from back in the days when you had to drill and tap them., highlevel gearboxes 60 to 1 on the front axel with the mashima pointing towards the smokbox , leaving the firebox and rear frames free to be filled with lead, I am close to seeing if I can make these kits work or will join the most of others made ingoing the display case ! Edited November 13, 2020 by Graham456 2 Link to post Share on other sites More sharing options...
33C Posted April 8 Share Posted April 8 I made two of the 2-4-0's. One uses the original kit wheels, the other, some Romfords i had lying about. Both utilise the Lima HO 4F tender drive for power with piano wire, wiper pick-ups on the rear of the drivers. Rover Damask red auto spray paint and hand lined. Both great runners. (Pics. 1+2, original kit wheels. Pic. 3, Romfords.) 8 1 Link to post Share on other sites More sharing options...
Barclay Posted April 9 Share Posted April 9 I really should build mine - it is definitely the longest serving inhabitant of the cupboard of shame, having been bought at The Engine Shed, Leytonstone High Road, in 1988! 1 3 Link to post Share on other sites More sharing options...
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