Abstract: A time display apparatus includes a display unit and a control unit, the display unit being provided with an indicator portion of variable area and the control unit being operative to alter the area of the indicator portion in accordance with a first unit of time to be displayed. An additional control unit is operative to alter the visual appearance of the indicator portion, without altering the area of the indicator portion, in accordance with a second unit of time to be displayed, wherein the first unit of time is a minute, and the second unit of time is an hour.

Abstract: A method for restricting access to network accessible digital information by network users of at least one subscriber network. The method comprises the steps of monitoring at each subscriber network all requests by the network users for digital information; determining whether a location indicator associated with each request is included in a database of restricted location indicators maintained at each subscriber network and denying the request where the location indicator is in the database.

Abstract: For cooling down a cryogenic model, provided for testing in a cryogenic wind tunnel, to the wind tunnel temperature and for performing mounting work and configurational changes on the cryogenic model, there is provided a working chamber which is supplied with warm air so that working personnel can enter it. The working chamber contains an insulating box, made from heat-insulating material, which has an open top and into which cold air is injected. The insulating box accommodates the cryogenic model under cold air conditions. Persons can perform manipulations on the cryogenic model while leaning over the edge of the insulating box. The cryogenic model is held on a holder which can be lifted upwardly out of the insulating box. Removal of the cryogenic model from the working chamber is possible by opening a top door.