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This report describes a thermal control coatings experiment conducted on the Air Force P72-1 satellite which was launched into a low earth polar orbit in October of 1972. The objectives of this experiment were to measure the amount of degradation of experimental thermal control coatings after exposure to the space environment and to correlate these results with those of space exposure for the same coatings measured in ground-based laboratory simulation equipment. Based on selected data from over 5000 revolutions covering a period of one year, it was found that all the coatings initially degraded to a greater degree than expected, possibly due to contamination. The most stable coatings were optical solar reflectors and the least stable was a white alpha-Al2O3 pigmented coating. An experimental fabric material showed greater stability than state-of-the-art white coatings.

1History of Mary Prince

By Mary Prince

Mary Prince was born into slavery in the West Indies. As a free woman in England she wrote her memoirs, which sold well and supported and publicised the anti-slavery movement. <br><br> NB This book contains racial vocabulary and refers to physical and sexual abuse that some listeners may find offensive or distressing. (Newgatenovelist)

2Catastrophe and Social Change, Based Upon a Sociological Study of the Halifax Disaster

By Samuel Henry Prince

The Halifax Disaster in 1917 was the greatest man-made explosion prior to the atomic bomb.<br><br> "The following pages [are] the result of an observational study of the social phenomena attendant upon one of the greatest catastrophes in history—the Halifax Disaster. <br><br> "[This book is not] a history of the disaster. It is rather, as the title suggests, an intensive study of two social orders, between which stands a great catastrophe, and its thesis is the place of catastrophe in social change.<br><br> "The account deals first with the shock and disintegration as the writer observed it. Individual and group reactions are next examined in the light of sociological theory. The chapters on Social Organization are an effort to picture that process as it actually occurred.<br><br> "The writer has also tried faithfully to record any important contribution which Social Economy was able to make in the direction of systematic rehabilitation. Special reference is made to private initiative and governmental control in emergency relief. This monograph is in no sense, however, a relief survey. Its chief value to the literature of relief will lie in its bearing upon predictable social movements in great emergencies. <br><br> "[The author believes this] to be the first attempt to present a purely scientific and sociological treatment of any great disaster." - Summary by TriciaG and the Preface