A NOTE FROM THE GUEST EDITORS

Working in animal behavior was challenging. It was the first time I came to the conclusion that I had to do something with my life, that there was work involved, and that if I wanted to accomplish something, I'd better figure out what it was and do it.—Exploratorium Explainer, 1974.     

NOTE ON THE PREPARATION AND MOUNTING OF SAMPLES OF CHALK/GLUE GROUND FROM PAINTINGS FOR SCANNING ELECTRON MICROSCOPY

Abstract

A complete summary of equations for leakage of enclosures is given, including vapour diffusion through still air in openings, and infiltration of air/vapour/particulate mixture. Stack pressure due to temperature and relative humidity difference drives most infiltration. Experiments confirmed the diffusion and infiltration equations for small and medium-size enclosures. Leakage for a carefully made display case with ordinary materials has been reduced to the microbarometric limit of about 0·03 of an air change per day. Simplified tables and charts of leakage are given for 0·1, 1·0 and 10m enclosures, as a function of crack width, hole width, and wall permeability.