Water pressure at the specimen fountain, measured at midday, arrives in a parabola roughly four inches high before folding back into the drain, enough to reach a stooped adult's mouth without soaking a child's chin, at least in theory, and almost never in practice. This is the enduring compromise of the public drinking fountain: a single arc calibrated for a citizen who does not exist, too low for the tall, too forceful for the toddler, too far from the button for anyone in a wheelchair, and yet used, daily, by all of them, with the particular grace of people making do.
Two basins are typical, though the second, mounted lower, ostensibly for children or wheelchairs, is more often used by dogs on a leash, who drink from it with an entitlement the fountain seems to invite. The steel is cold to the touch even in August, having been buried the winter before and warmed only by hands. Corrosion begins at the drain and works outward, a slow map of every mouth that has ever leaned in. The button itself, chromed once and now the dull grey of a nickel worn smooth, requires a specific and slightly undignified pressure, thumb, not finger, that regulars know and visitors discover by trial. There is no other object in the civic landscape that so many strangers touch with their lips in good faith, trusting a pipe they cannot see, laid by a crew they will never meet, to have done its job honestly. It is a small, daily act of trust so ordinary that no one thinks to name it as one.