Abstract: The installation contains, in the entrance monitoring apparatus (10 and FIG. 2), a magazine (36) with a stock (37) of parking tokens which have been individually marked before insertion into the magazine. The entrance monitoring apparatus furthermore contains a reader (39) which operates in conjunction with an electric central unit (13) in order to store the marking on each parking token issued and the time of issue of the token. The cash register (12) of the installation contains a reader which, when a parking token is inserted, calls up the relevant time of issue and calculates the parking fee from the time difference. After the fee has been paid, the time of issue in the memory is erased, and the time of payment is stored. The exit monitoring apparatus (11) contains a further reader which calls up the time of payment when the parking token is inserted, and opens the exit barrier (16) if the time span between the time of insertion and the time of payment is within a predetermined tolerance time.

Abstract: The apparatus for determining the pressure of capillary water in the ground, especially in soil, is of a two-part design and comprises a probe tube and a pressure measuring device. The pressure is measured by means of an elastically deformable membrane. For pneumatically coupling the pressure measuring device with the probe tube the latter is closed by a pierceable and self-sealing closure member. A hollow needle suitable for piercing the closure member is attached to the pressure measuring device. Either at or in the elastically deformable membrane there are arranged mechanical-electrical transducers which can be connected to an electric measuring and evaluation instrument for indicating the pressure which corresponds to the deformation of the membrane.