The atmospheric pressure was, in turn, measured with the electronic barometer at the time each equilibrated air sample was injected into the gas chromatograph.
(The atmospheric pressure; measured; with the electronic barometer at the time) (each equilibrated air sample; was injected; into the gas chromatograph; T:in turn; T:the time)
The atmospheric pressure each equilibrated air sample
measured was injected
with the electronic barometer at the time
into the gas chromatograph T:in turn T:the time