Yet both have similar lineage, being developed not far from one another by modern measurements of distance. (linkroll.com)
The process was thought to have pretty much stopped as ships moved to more modern measurements by taking temperatures directly in the water right by their engine intake valves. (scientificamerican.com)
To understand how wrong they were, we need to look at modern measurements of the rate of absorption of infrared light by CO2. (realclimate.org)