The difference arises in the formation of the top plate. In method 1, pre-sifted soil is piled on the plate and grooved and fused in a similar manner to the bottom plate. The soil is then flushed out with water or gas and separated in a filter. In method 2, a mold or caul is used which is grooved top and bottom to fit the desired groove pattern. The soil is then piled on top and grooved and fused as in method 1. The caul is then pulled out of the side and placed back on the base plate for the process to be completed. A steam supply header must also be formed and a similar caul method can be used with the caul being pulled progressively along the plate. Connections between the header and the radiator proper can be made with pipes of diameter 1-3 in. In the event of a leak the pipe leading to the radiator would be fused shut until such time that repair could be undertaken. Alternatively a glass patch could be melted over the leak spot. Such techniques may be feasible with unbeneficiated regolith and previous work on glass fusion using penetrators have shown there is no significant difference in glass forming abilities between different areas of the soil. It would be beneficial to use pre-
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