The document discusses thin walled pressure vessels and provides analysis methods for spherical and cylindrical vessels. It defines thin walled vessels as having a ratio of inner radius to wall thickness greater than 10:1. For spherical vessels, it describes calculating maximum shear stresses on the inner and outer surfaces by drawing Mohr's circles. For cylindrical vessels, it notes there are longitudinal and hoop stresses, and that hoop stresses are twice as large as longitudinal stresses. It provides examples of calculating these stresses.