straightshooter wrote:To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.
Wombat wrote:straightshooter wrote:To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.
If you really want to be pedantic- The (international) inch has been exactly 25.4 mm since July 1959. At this point in time the (international) yard was redefined as 0.9144 metre - until this time the ratio between the US yard and the metre was different to the ratio between the UK yard and the metre. For more information, see Engineering Metrology by K J Hume (2 ed) Macdonald London 1967. The American inch changed by 2 millionths of an inch and the UK inch by 1.7 millionths of an inch. The international inch falls mid way between the old UK and US inch.
Daddybang wrote:Wombat wrote:straightshooter wrote:To be pedantic 1" = 25.4mm.
As an aside
If you put a 1" (25.4mm) scope tube in 26mm rings problems will arise.
Similarly a 26mm scope tube won't fit in 1" rings.
Avoid rings that say they are 1" and 26mm.
The rings can only be truly compatible with one tube size or the other or neither but not both.
If you really want to be pedantic- The (international) inch has been exactly 25.4 mm since July 1959. At this point in time the (international) yard was redefined as 0.9144 metre - until this time the ratio between the US yard and the metre was different to the ratio between the UK yard and the metre. For more information, see Engineering Metrology by K J Hume (2 ed) Macdonald London 1967. The American inch changed by 2 millionths of an inch and the UK inch by 1.7 millionths of an inch. The international inch falls mid way between the old UK and US inch.
Wombat mate ya need to spend more time shooting!
Wombat wrote:Some things you just dont measure, unless you are sure the answer will be impressive.
When I started 25 odd years ago doing the same stuff I am now there was an old Bloke who got very very upset whenever a certain 1'' alloy rod looked like it was going to be used. He was adamant that it was not going to be wasted where another piece could be used instead.Caused him no end of upset as it was the last piece of Imperial inch stock available.So I did research it and pointed out that minor temperature variations would move the size much more than the new standard. Lots of arguments.
He died about 10 years ago.
But today, after moving factories and updating machinery there's still a section of 1" imperial std alloy rod on the rack, marked "Do Not Use - ask John". Still makes me smile whenever I see it.