Finally ! a scope for my No.4 T

[spitfireblue]

Finally was able to find a scope I could afford for my No.4 ... Really happy.. I wonder if anyone could tell me? There are a couple of repairs to the tin it came in. both brazing. Were the tins repaired in service or just discarded and replaced? Just curious if the repairs were post service.

Information

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[Peter Laidler]

We repaired everything that was economic to repair, so yes. Latches and the rivets were replaceable parts so they were also repaired too

[CINDERS]

Hi Peter,
Just a question regarding the scopes when they are not matched to the rifle is there bound to be much difference in the POI's or is there enough built in adjustment on the scopes to say take the slight alignment problem (if any) out as the tolerances you all worked to were very stringent 2 thou max I think I read somewhere, all the information I have read indicates they are a matched pair when brought together for the first time and are to stay matched.
Just curious that's all.

[Peter Laidler]

Originally, the BRACKET is matched to the rifle and collimated to the bore. When a telescope that is 'centred' is fitted to the bracket, it must be, by definition, pretty well matched toi a) the mechanical centre axis of the bracket cradle and therefore aligned with b) the axis of the bore. There is a small leeway allowed to allow for a) mechanical adjustment and b) zeroing by the sniper.

But while bracket a might fir rifle b, the mechanical axis of the bracket bore might not align correctly with the mechanical axis of the rifle bore. Therefore to set the telescope up with the 'new' bore might mean that the gtip of the graticle could be....., well....., anywhere! To be CORRECT, it MUST be in the centre of the focal plane or optical axis of the telescope.

From this, you'll understand why it was a simple job for Armourers to swop a telescope from a matching rifle and bracket between another matching rifle and bracket. But another MUCH more difficult thing to swop brackets between rifles because it is the BRACKET that is matched to the rifle and not the telescope.

This is the reason why, later in the 40's that in order to prevent ANY cross matching/mixing, the BRACKET was numbered to the rifle. Previous to this instruction, if an Armourer or Instrument tech took a telescope out of, say, six brackets, then any hope of matching a bracket to a rifle again was lost.

This might not have answered the Q but there it is in precis form.

So now, when you see a 'perfect factory matching set' look at the telescope. If the point of the grat is in the centre of the optical focal plane, it's right. If it ain't, then it ain't!

[spitfireblue]

Might have just been my luck lately but with a load of 4064 and a Sierra 180gr bullet.. the scope was one inch high at 100yrds when set on zero for range and 3.5 inches left. I moved the deflection drum ,which will leave it somewhat off center , to zero it , moved the scale and was all done in about twenty minutes.. A great day!( the grat still appears centered)
Thank you Peter for the info on repairs! When you guys fixed this one it was very well done! I am sure the repairs made it very much stronger than it was originally!

[Surpmil]

Nice piece. Looks like Cooke, Troughton & Simms (?)

[spitfireblue]

Yes! a real beauty... 90% I would guess for finish. Thanks..