Breadcrumb Home 1A30.40 - Chalk Globe Code Number: 1A30.40Demo Title: Chalk GlobeCondition: GoodPrinciple: CoordinatesArea of Study: MechanicsEquipment: Large or small chalk globe, fluorescent chalk.Procedure:Use bright chalk to draw lines and coordinates on the chalk globe. String may be used to show that a straight line is not the shortest distance on the curved surface of the globe.