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tangular tubing joined to form a polygon, is placed and attached to the lifting lugs by hooks. Screw jacks are used to tension the assembly and prevent inadvertent unlatching. The container is filled through the interior of the polygon into an opening in the container. The container may be filled, capped, handled, and the grapple beam removed by remote operations.
4728222
A R R A N G E M E N T F O R C O L L E C T I N G S E E P A G E W A T E R
F R O M D E P O S I T O R I E S
Klaus Wiemer, Kronberg, Federal Republic Of Germany assigned to ED Zublin Aktiengesellschaft
To control the spread of water from a waste depository body, a drainage layer and a sealing body are provided below the depository body. A control room underlies a major portion of the depository body and a major portion of the sealing body for facilitating visual inspection and repair of the sealing body and the drainage layer. The sealing body includes one or more plastic sheets inclined at an angle with respect to the horizontal to define water collection fields or areas. The sealing body may comprise a platform forming the ceiling of the control room, the ceiling platform being provided with pipelines
Patents
for drawing off depository gases and with pas- sages or openings for draining off seepage water.
4728794
R A D I A T I O N S E N S I N G A R R A N G E M E N T S
Nicholas S Allen, Windsor, United Kingdom as- signed to Graviner Limited
A fire or explosion detection arrangement has a housing with first and second adjacent radiation- transmitting windows. The first window includes a filter having a passband corresponding to a narrow predetermined wavelength band. A radiation sensor mounted within the housing receives radiation from a fire or explosion through the first window, the predetermined passband corresponding to a wavelength band within which a fire or explosion to be detected generates radiation. An external source gene- rates testing radiation having wavelengths capable of passing through the second radiation transmitting window but not through the filter. This radiation is directed to the sensor. There, means (either the sensor itself or, for example, an FET which is provided to process the normal output of the sensor) responds to the level of the testing radiation and a circuit determines from this level whether the obseuration of the second window is excessive. This is used to assess whether the obseuration of the first window is above or below a predetermined level.
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