• Testing magnet - Electrical Lab 

        Contributor:Colorado Agricultural College
        Date:undated
        Five men testing the strength of a large magnet in a classroom by having 1 man hang onto its underside.
      • Testing magnet - Electrical Lab 

        Contributor:Colorado Agricultural College
        Date:undated
        Four men seen testing the strength of a large magnet in a classroom by all hanging onto its underside.