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Parts 46-48d: Double angle strips
|46||Double angle strip, 2½''x1''||1904||-||4||4||4||N°7||Was Large bent strip|
|47||Double angle strip, 2½''x1½''||1919||-||2||2||2||N°10||Part 112 until 1923|
|47a||Double angle strip, 3''x1½''||1921||-||2||2||2||N°10||Part 112a until 1923|
|48||Double angle strip, 1½''x½''||1919||-||8||8||4||N°4||Part 60a until 1923|
|48a||Double angle strip, 2½''x½''||1912||-||18||18||12||N°0||Part 60 until 1923|
|48b||Double angle strip, 3½''x½''||1919||-||12||12||8||N°6||Part 60b until 1923|
|48c||Double angle strip, 4½''x½''||1921||-||4||4||4||N°8||Part 60d until 1923|
|48d||Double angle strip, 5½''x½''||1919||-||5||5||4||N°8||Part 60c until 1923|
In 1912 the 2½''x½'' double angle strip was introduced as part number 60, and then in 1919 most of the other sizes were introduced; what is now part 47 was part 112 and the other double angle strips were numbered 60a/b/c. Part 46 was renamed from Large Bent Strip to Double Angle Strip 2½''x1'' at this time. In 1921 the final two versions were introduced, the strange 3''x1½'' as part 112a, and the 4½''x½'' (out of sequence) as part 60d.
The HSMD was introduced in 1909, as three separate outfits A, B, and C. It was not a success and was dropped in 1914.
The chaos of this numbering system was too much. Parts 47 and 48 in the main sequence were available (they had been used for a variety of spring balances and dynometers in the HSMD), and all of the double angle strips were renumbered into the sequence seen above.
The 2½''x½'' double angle strip is one of the most common of all parts, but is very often found bent and misshapen in Meccano collections. Really good examples of early ones are sometimes hard to find.
Chronological variationsThe most important change from the point of view of the Meccano builder is in the overall length of the parts. Some (EMP included) document that all of the double-angle strips can be found with the principal measurement correct either externally or internally. That is, the 2½''x½'' double angle strip is 2½'' overall or 2½'' inside the faces. I haven't found this to be the case. In my experience, almost all nickel-plated ones are longer, sometimes substantially longer, than later painted varieties. This can be seen clearly in the photo to the right.
The examples shown aren't carefully selected parts -- they are randomly chosen. The first three show nickel-plated parts from 1916, 1919, and mid-1920's. The later ones are all identical in length, and cover a range of eras from early 30's to 70's.
Although the nickel ones aren't consistent in length, they are on average significantly longer than later versions by at least a couple of thicknesses of a strip. Early manual models rely on these lengths, and when rebuilding these models with later parts you need to be aware that your double angle strips are likely to be shorter. John Nuttall takes up the story:
Be careful dating with the Meccano Magazine. We can only be sure that the parts existed by that date, but they may well be several months or even years older.
The September '25 MM has instructions for a 4-6-2 tank loco. This has a 48a bolted to a 2½'' square plate forming part of the cylinder block. This is clearly the short version. The earlier, longer version would stick out a bit on each side of the plate and in the pictures of this model it clearly doesn't. In the side view, Fig. B, page 449, the lugs of the DAS are hidden behind the plate, showing that the DAS must be exactly 2½'' (or slightly narrower) overall; i.e. the shorter version. Several 3½'' ones in the same model look like the short version, but it's not 100% certain.
I could find nothing earlier than September '25 showing the shorter version of any DAS. It is possible, indeed likely, that different sizes changed at different times and the changeover was staggered over several months. At least for 48 & 48a we can say with some certainty 1925 for the change to the shorter length. This may be correct for all, but some could be 1926. John Nuttall
Interestingly, examples of iridescent (1979) part 48's I've seen have radiused ends, which is the only example of part 48 where the ends don't match the ends of the contemporary part 5. Further research is needed...
Variations and odditiesThis leads us to the French part 48a, 2½''x½'' double angle strip. UK versions have truncated ends, which is unexpected as the equivalent unbent strip doesn't. However, double angle strips can be found with radiused ends as seen in this picture, but they turn out to be French ones in the examples I have come across.
Dealer spare parts boxes
Individual part numbersPart numbers for the parts on this page are as follows: Unique part numbers
For identification, each variation has been given a suffix to the main Meccano part number. These suffixes consist of a two-character code for the colour, and if there are many variations, a further number and sometimes letter code to identify each variation. See the bottom of the 'Parts' page for further details.
You don't need to worry what the codes are, just click on any one for a photograph.
The button above turns on and off the display of DMS numbers (where they are known). The DMS (Development of the Meccano System, Hauton and Hindemarsh) published in 1972 and added to in 75 and 82, suggested part numbers for every variation of every Meccano part. These numbers aren't perfect, but they are recognised and also referenced in the EMP (Encyclopedia of Meccano Parts, Don Blakeborough).
|Tinplate with rolled-over edges||04||.mm|
|Blackened steel ||15-16||.bk|
|Nickel plated, shorter (length is overall)||25||.ni1||.ni1||.ni1||.ni1||.ni1||.ni1||.ni1||.ni1|
|Medium green (pre-war)||33||.mg1||.mg1||.mg1||.mg1||.mg1||.mg1||.mg1||.mg1|
|Olive green (Mechanised Army) ||39-41||.ma|
|Medium green (post-war)||45||.mg||.mg||.mg||.mg||.mg||.mg||.mg||.mg|
|Zinc with truncated ends||73||.zn1|
|Olive green (Army Multikit) ||73||.am|
|Yellow (Highway Multikit) ||74||.ye||.ye|
|Dark yellow (Highway Multikit) ||78||.dy||.dy|
|White (Space) ||79||.wh||.wh|
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greg share (at 11:35am, Tue 10th Nov, 20)
Pleas, I need 3 double angle strips part 48d light green
Ronnie Corbett (at 1:27pm, Fri 23rd Jul, 10)
Nickel plate was perhaps price sensitive at those difficult times. Spraying silver or yellow paint (often over earlier green paint!) probably made more financial sense. Then zinc plating came along and was probably seen as an effective and cheap dipping process. Unfortunately, as history told us, the preparation was often not good and the plating tarnished somewhat. It may also be the case that the nickel parts which you have were unusual, quasi-experimental pieces which were released for a short period and then dropped. Odd colours do tend to turn up from time to time, a fact to which the learned authors will doubtless attest!
Ronnie Corbett (at 1:25pm, Fri 23rd Jul, 10)
Nickel plate was perhaps price sensitive at those difficult times. Spraying green or yellow paint (often over earlier green paint!) probably made more financial sense. Then zinc plating came along and was probably seen as an effective and cheap dipping process. Unfortunately, as history told us, the preparation was often not good and the plating tarnished somewhat. It may also be the case that the nickel parts which you have were unusual, quasi-experimental pieces which were released for a short period and then dropped. Odd colours do tend to turn up from time to time, a fact to which the learned authors will doubtless attest!
Stephen Brook (at 1:16pm, Fri 23rd Jul, 10)
Thanks for the information, Ruban. If that is the case, in my humble opinion it is a pity they didn't go for nickel plate for all strips, girders etc in 1964 instead of silver paint or the poor zinc plate which followed it.
Ruban Abraham (at 3:49pm, Fri 16th Jul, 10)
Steve, the part is probably from the light red and green or silver/yellow black era. As we know, 48a was seen in various colours at the start of the b/s/y period, including yellow. I hope this is helpful.
Stephen Brook (at 1:16pm, Wed 14th Jul, 10)
I have a nickel plated 48a which is stamped "Meccano made in England" - so, presumably, post world war 2. Does anyone know anything about this part ?