The Paper Tape and the Plague: How a 17th-Century Parish Clerk Saved Lives With Data
We often imagine data as a modern phenomenon, a torrent of ones and zeroes flowing through fiber optic cables. But the human impulse to record, to count, and to preserve public information is ancient. Long before servers and spreadsheets, there was paper, ink, and the meticulous hand of a parish clerk. And in the summer of 1665, in the small Derbyshire village of Eyam, this impulse became a matter of life and death.
The man holding the pen was William Mompesson, the village rector, but the man keeping the counts was likely the parish clerk, an anonymous figure whose daily work became the backbone of a radical act of communal sacrifice. As the bubonic plague arrived in a damp bundle of cloth from London, Mompesson faced an impossible choice: let villagers flee and risk spreading the pestilence across the Peak District, or convince them to stay, sealing their own fate to save countless others. He chose the latter, and the parish clerk’s records became the instrument of their isolation.
This was data collection stripped to its most vital core. Each day, the clerk would record the grim tally. The Bills of Mortality were not complex datasets; they were simple, heartbreaking lists of the dead. But their power was in their consistency and their publicity. They were a shared, trusted record that everyone could see. The data made the abstract horror concrete and measurable. It allowed the village to manage the crisis, to track the spread, and to understand when the peak had passed.
More importantly, this data facilitated a crucial, life-saving ritual. To sustain the quarantined village, surrounding communities would leave supplies at a designated boundary stone, a large gritstone rock with holes bored into the top. The people of Eyam would leave payment for these goods in the same holes, but the transaction was mediated by data. The coins were soaked in vinegar, believed to disinfect them, but the trust was built on the publicly available records. The outsiders could see the toll the plague was taking; they knew the sacrifice being made. The data was a bridge of empathy and understanding across a cordon sanitaire.
Eyam’s story is rightly remembered for its heroism. But it is also a profound lesson in digital preservation and open data, centuries before the terms existed. The parish clerk wasn’t just keeping a list; he was creating a preserved, public record that enabled a community to function under the most dire circumstances. His handwritten logs were the API that allowed two isolated groups to communicate, trade, and maintain a fragile bond of humanity. They were open, readable, and utterly essential. They were data with a direct, immediate, and moral purpose: not for profit or optimization, but for survival and solidarity. In our age of vast, often incomprehensible datasets, the simple, terrible ledger of Eyam reminds us that at its heart, preserving public information is about preserving one another.
Notes & further reading
A few pages I came back to while writing this: