I am not an airflow engineer and wish all concerned to reach the right conclusion, it crosses my mind whether the shaft diameters and workings in the Yorkshire comparison might have a bearing on the flow measurement, my grandfather was a mines rescue man and pit fireman, (not at the Grove)
I am not an airflow engineer and wish all concerned to reach the right conclusion, it crosses my mind whether the shaft diameters and workings in the Yorkshire comparison might have a bearing on the flow measurement, my grandfather was a mines rescue man and pit fireman, (not at the Grove)