Standpipe52 connects to pipe Tee 53 and extends upwardly, with its upper end open to the atmosphere to avoid siphoning fluid from tank 40.FIG. 2 is taken along cutting plane 2,5--2,5 as indicated in FIG. 1 so as to show a plan view of the interior of auxiliary tank 40.FIG. 3 is a cross-section view taken along cutting plane 3--3 in FIG. 2 to give a better view of drum drive details.FIG. 4 is a cro