Volunteer fireman Jon Ober with Gloucester Volunteer Fire and Rescue shows 10-year-old Robert McTurnal of Glenns, how to operate a chemical fire extinguisher during the 1990 open house at Gloucester’s Station One. The open house was held as part of the observance of Fire Prevention Week. The theme for this year’s Fire Prevention Week, which is now underway, is “Smoke Alarms: Make Them Work for You!” which aims to educate the public about the importance of having working smoke alarms in their homes....