• Provision has been made for supplying more highly developed systems.
• Care was taken to maintain a low concentration of ...
• Make sure ( or See to it that ) all screws are tightened up.
• Precautions have been taken to reduce effects of vibrations in the analyzer.
• Steps should be taken to ensure proper filtration.
• The airship net which is held down by sand bags is permitted to rise slowly, care being taken that the envelope does not slip out from under the net.