Much has been written re the long term temp variation of the climate but
as it appears were talking about around 1 deg C change over quite a long
time, pre industrial era, just how absolute accurate where the
thermometers in use?.

Course these days there are some very accurate ones around but back then
in the 1800's how accurate was a standard one back then anyone any
idea?.

Lets not take into account as to where the measurement was made either
in town out in the country at the sea side etc, but the gear in use to
measure?.

--
Tony Sayer


Man is least himself when he talks in his own person.

Give him a keyboard, and he will reveal himself.