US Government As Represented by the Secretary of the Army

John E Lambright

John D Estes

Keith J Conklin

A gas particulate filter system is provided for supplying clean heated air o an operator subjected to ambient environments containing nuclear, biological or chemical contaminants. The filter unit includes replaceable radial flow canister means, centrifugal blower/heater means, continuously variable electronic control means for regulating air temperature and air flow, and clamping means for easy assembly of the components under adverse field conditions.

One-man gas particulate filter unit

Described is a control circuit or energizing circuit for a series field mr. To limit the surge of inrush startup current to no greater than the steady-state running current, a series string of three thermistors is inserted in series with the motor. The thermisters have negative temperature coefficient, and have nominally equal ratings and values. The circuit has application in motor/blower systems.

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S. Daytona, FL, United States of America

John E Lambright