oldest temperature

My son's science teacher told the class that "air temperature has been rising the past 300 years, as proven by thermometers, and indirect means.

I thought I recall seeing the oldest air termperatures on record posted somewhere on this site (and I have not been able to find this on the web.) Does someone have this? I wanted to either prove or disprove this statement

Thanks
bill

The oldest instrumental temperature record is from central England:

http://en.wikipedia.org/wiki/Central_England_temperature

I posted about this place months ago, but it has fallen off the 90-day limit on Astromart.

Here is their September temperature record, since we just finished September.



Here is their annual mean for the entire record.


The short red line is their '91-'99 average. Not sure why they would put that onto their record without including 10-year averages across the whole record. Might as well add a 2000-2009 average now, too.

The graph clearly shows unstoppable global warming at unprecedented rates ... from 1690 - 1740.