Pressure / Volume Gas relationship Pendle Hill experiment

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The Pendle Hill experiment by Henry Power and Richard Towneley demonstrated the relationship between gas volume and pressure, leading to Boyle's Law. As the experimenters ascended, they observed an increase in gas volume. The question arose about whether the gas in the barometer was isolated during the climb or if the experiment was repeated at the summit. It was clarified that the observed changes were due to external air pressure affecting the mercury in a Torricelli-type barometer. This highlights the influence of atmospheric pressure on gas measurements during the experiment.
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I was reading about the Pendle Hill experiment by Henry Power and Richard Towneley showing the relationship between Volume and Pressure in gas that eventually became Boyle's Law.
The higher they got the greater the volume became.
My question is, was the gas measured in the barometer isolated from the bottom of the hill as they climbed or did they repeat the experiment again at the top? If it wasn't repeated why was the gas pressure / volume level affected if it was isolated on the whole trip higher up the hill?

Thanks
Woops if this is more relevant to a chemistry forum
 
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Believe I found my answer, it's the air pressure from outside hitting the mercury if they were using a Torricelli type barometer .
Thanks
Feel free to expand or edit if anyone wishes to comment
 

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