CHALLENGER'S LOST LESSONS - ER - NASA

42The field of the cylindrical magnet projects from the end ofthe magnet and loops around the iron cylinder’s side. The causes theiron filings to stick out like hair brush bristles on the ends of themagnet though they lie flat against the side of the magnetic cylinder.The overall shape of the filings combine to show approximately theshape of the magnetic field’s lines of force in three dimensions.Hopefully, this shape wouldhave been similar to that of Christa’s magnetic chamber. The lostlesson’s iron-like filings would have clustered about the chamber’selectro-magnet in like fashion.Discussion: Bob Mayfield’s discussion of magnetic filingbehavior in zero-G versus one-G seems sound. However, watchingthe KC-135 video shows the filings behaving in a fashion that mightcompromise the on-orbit experiment. Performing the classroommagnetic experiment helps to understand difficulties that might havebeen encountered by Christa. Since the force of the electromagnet isquite weak, and the filings would be randomly dispersed about theclear chamber, would the drawing power be sufficient to pull themetal filings into a lines-of-force pattern, even in zero-G? Perhaps,Christa would have had to move the chamber back and force to assistthe collection of the particles about the center electro-magnet,assisting the drawing power of the field in capturing the filings.Finally: Christa performed the magnetism demonstrationboth without gravity, on the KC-135 zero G aircraft, and in theshuttle mock-up at the Johnson Space Center. Carefully view bothvideos. What, if anything, is alike and what is different about thetwo times the experiment was practiced? Click on the videos belowfor your evaluation. (Since the experiment was only designed towork in orbit, i.e., with zero gravity, neither the ground nor KC-135practice trials actuated the electro-magnet. However, the KC-135trial did have the file-like particles in the magnetism chamber.)What deserves consideration and investigation were theproposed ways Christa suggested moving the magnetic chamberduring the course of the experiment. List Christa’s suggestions.