| http://www.w3.org/ns/prov#value | - These and such other objects as may hereinafter appear are attained in the embodiment of the invention disclosed in the accompanying drawings, wherein: FIGURE 1 is a longitudinal, vertical section taken along the line 1-1 of applicants transducer set forth in FIG- URE 2; FIGURE 2 is a section along the line 2- 2 of FIG- URE 1; FIGURE 3 is a section taken along the line 33 of FIGURE 1; FIGURE 4 is
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