Demonstration Dynamo, Hank Crank, Electrical Output Via 4mm Terminals, Hand Powered, May Also Be A Motor Powered By 6 To 8V Power Supply, Model Is Mounted On A Base Plate 200 X 125 mm Approx. Which Also Carries A Hand-Drive Pulley 125 mm Diameter Coupled
Dry Field Mapping Kit, includes cork-covered base, 30cmx26cm; pad of 25 sheets pre-printed conductive paper 28cmx21.5cm; pad of 100 sheets preprinted paper for drawing fields; ten metal-headed push pins; a silver conductive pen