Abstract: In a rotating disc information storage system, a cover is designed to induct laminary airflow at the disc surface and to reduce the impurity level of the disc atmosphere. The laminar airflow results from the shape of the cover which closely conforms to the contours of the disc and its drive spindle and is closely spaced thereto. The impurity level is reduced by the spiral airflow produced by disc rotation being provided to a divergent filter duct and filter to capture airborn particles. The divergent filter duct and opening to the duct are formed between the cover and a wall around the periphery of the disc. The position of the wall is mechanically adjustable to control the spiral airflow into the filter duct. Air is filtered and returned to the disc storage system.

Abstract: A portable depository container 10 for an automated teller machine (ATM) articles as, for example, magnetic credit cards captured by the ATM. With the container dismounted from the ATM, an entry slot 16 is locked against passage of articles therethrough by means of a bar 22. Upon the container being mounted in a receiving cradle 18 of the ATM, the bar 22 is moved to an unlocked position by means of key pins 168, 170 which engage and move rearwardly with a pair of slide members 42, 44. This movement of the member 42 brings about a rotational movement of a resettable indicator wheel 76 which carries a series of markings on its perimeter. The particular marking of the wheel 76 visible through an indicator window provides an indication of the number of times the bar 22 has been unlocked since resetting of the wheel, and can thereby indicate whether tampering with the container has taken place. A second embodiment for handling articles such as currency in envelopes utilizes a resettable indicator slide 208.