Original oil and gas trade magazine vintage ad for NATIONAL LEAD COMPANY of Houston, TX. Baroid Division. Baroid Well Logging lets you ride your bit to bottom. You can depend on Baroid mud and cuttings analysis to give you a deep down picture of your well that's accurate. Baroid Automatic gas detectors. Unique 1955 old oilfield petroleum drilling industry magazine advertisement. Approximate size 9 x 12 inches.