Perry Oceanographics, Inc.

Charles R Yemington

Harvey A Miller

Jon P Newman

Thomas C Schmidt

The integrity of the insulation of an electrical device composed of at least two conductive members having a potential therebetween and at least two insulating layers successively surrounding the conductive members, is monitored by interposing an electrically conductive, integrity monitoring layer between the two insulating layers so that a first one of the insulating layers is disposed between the conductive members and the conductive layer and a second one of the insulating layers is disposed between the conductive layer and the environment surrounding the device, monitoring the impedance of the first layer between the conductive members and the conductive layer, and monitoring the impedance of the second layer between the conductive layer and the surrounding environment.

Monitoring of electrical insulation integrity

The ambient pressure of the environment of an individual within a vessel is varied between an upper and lower pressure value by providing the vessel with a mass of gas sufficient to fill at least a substantial part of the vessel, and varying the quantity of liquid, primarily water, in the vessel in order to cause the pressure therein to vary correspondingly between the upper and lower values.

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Palm Beach Gardens, FL, United States of America

Charles R Yemington