| http://www.w3.org/ns/prov#value | - My invention is illustrated more or less diagrammatically in the accompanying drawings, wherein-- -F-IGURE 1 is a front elevation of the unit; FIGURE 2 is a section along the line 2-2 of FIGURE 1 looking in the direction of the arrows; FIGURE 3 is a side elevation of the right hand side of FIGURE 1 in part section along the line 33 of FIG- URE 1; FIGURE 4 is a detail section along the line 4-4 of
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