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dan's 'pumping away' book
phew! fortunately, i tested it before taking it in. and i'd'a had a hard time explaining a failure when i'm trying to convince workmates of the better science behind pumping away
yeah, i wondered about the gauges vs small measurments, and i'll have to wait until tomorrow to get a mag and or more sensitive gauges
but ya know, when i made a 'leak' in the system by opening an 'air bleeder' valve, i did seem to see a diff just before both gauges went to 0. and what i'm hoping to see is a vacuum at the critical point, in order to prove that the system, when improperly plumbed, could take in air at any leak