For an idea of scale, this page includes a photo of Maurice Wilkes next to the mercury delay lines of EDSAC: http://amturing.acm.org/info/wilkes_1001395.cfm htt

For an idea of scale, this page includes a photo of Maurice Wilkes next to the mercury delay lines of EDSAC: http://amturing.acm.org/info/wilkes_1001395.cfm http://amturing.acm.org/info/wilkes_1001395.cfm The tubes are 5 feet long (the whole tank is about 6' including the transducers at each end). I think that tank holds 16 tubes, so I'm guessing from the figures in geon's post that there must have been another tank too.