The ladder creaked as it descended into the cellar. Below, the light thinned to a yellow haze, catching on rough boards and packed earth. In winter, this was where Jacob Mumma slept, wrapped in a shirt, drawers, and a crude mantle made from a muslin sheet with a hole cut for his head. The room was scarcely eight by ten feet. It had been built under his direction, reached only by ladder, and fitted with a crawl-hole through the stone wall so he could slip outdoors unseen at night. One visitor would later say it felt less like a room than a dungeon.
By the time of his death on February 5, 1893, Mumma had not been part of public life for decades. Yet in the countryside outside Hanover, stories about him circulated constantly. Children dared one another to catch a glimpse of the recluse. Adults devised excuses to wander past his home. When he did appear in town, which was rare, he became an object of hushed fascination.
Jacob Mumma was born on April 17, 1819, at Mumma’s Mill, along the York Road in what later became the suburb of Baresville. His father, Samuel Mumma, was a miller with a restless mechanical mind. On the family farm, Samuel built a hand-powered fire engine and devised a spark arrester for locomotives, among other inventions. Jacob inherited those same mechanical talents. As a boy, he was considered bright. As a young man, he was energetic and ambitious, driving fine horses and introducing one of the first buggies seen in the neighborhood.
For a time, his life followed a familiar arc. He tried his hand at portrait painting and later turned to watchmaking, a trade that combined art and precision. In about 1846, he carried several of his paintings to New York City, hoping to sell them. What he found there discouraged him. Surrounded by works he judged vastly superior to his own, Mumma returned home without ever offering his paintings for sale. It was a quiet turning point, one that marked the beginning of his withdrawal.
By 1848, he was pulling away from society and devoting himself almost entirely to study and mechanical design. Rumors soon followed. Neighbors whispered that he was obsessed with perpetual motion. The truth, as far as it can be traced, was more specific and perhaps more attainable. Mumma was fascinated by the idea of designing a watch that would run for eight days on a single winding. Whether he ever achieved that goal remains unknown.
In the late 1850s, he made a mysterious trip to England. The details are scarce. It was later said that he had been offered a substantial sum for a patent during that journey, but no documentation survives to confirm it. Like so much of Mumma’s life, the trip hangs in the historical record as a tantalizing fragment, hinting at possibilities that were never fully realized or recorded.
As the years passed, Mumma’s retreat became more extreme. During the Civil War, he was drafted in 1864 but failed to report for duty. A provost marshal’s guard eventually escorted him to Carlisle, where examining surgeons released him from service. This was one of the last times he was seen publicly. From that point forward, he vanished almost entirely from view.
The war itself briefly touched the land around Mumma’s retreat. On June 27, 1863, Confederate cavalry under Lt. Col. Elijah White passed through Hanover, seizing horses, supplies, and valuables. A chest stolen from local jeweler William Boadenhamer—containing nearly one hundred watches and pieces of jewelry—was opened beneath a tree near the Mumma family’s grist mill, then occupied by Jacob’s brother Samuel. After distributing what they needed, the raiders rode on, later claiming the remainder of the loot was buried somewhere nearby. There is no evidence Jacob Mumma knew of the cache or its fate, but the episode unfolded on the very ground where he lived and worked, involving the precise objects—watches, mechanisms, hidden valuables—that defined his secluded life.
For nearly fifty years, Mumma lived as a recluse in his family home. He occupied a series of modified rooms that reflected his growing desire for isolation. Two upstairs rooms were connected by a rough opening cut through the wooden partition. Another ladder dropped through an eighteen-inch hole in the floor to a small room on the first level. Later still, the cellar den was added. The arrangement allowed him to move throughout the house without ever being seen.
Editor M. O. Smith of The Hanover Herald, who inspected the house after Mumma’s death, described the cellar space as prison-like. The comparison stuck. In winter, Mumma slept there in a bunk, descending by ladder each night. He also cut an opening in the cellar wall so he could crawl outside under the cover of darkness. Daniel Snyder, a local craftsman, built the den exactly to Mumma’s specifications.
Despite his seclusion, Mumma remained intellectually engaged. He subscribed to Scientific American and several watchmaking journals, contributing articles and exchanging publications with a local jeweler. His mind, it seems, never retreated as far as his body did. What drove him deeper underground was not ignorance, but a deliberate turning inward.
Even in death, Mumma defied convention. Years earlier, he had commissioned a tin box from a local tinner, claiming it was meant to hold a machine. In truth, it was a coffin. At his request, he was buried inside it, the tin case enclosed within a wooden coffin. A pane of glass set into the metal allowed his face to be seen.
Mumma was the last of his family. His mother had died years before. His father passed suddenly in 1885. His only brother was found dead in the old mill on December 8, 1891, after years of blindness. Jacob himself died two years later on February 5, 1893, at the age of seventy-four. He refused medical attention during his final illness, saying that if it was the Lord’s will for him to go, he was ready.
His funeral was held at the Hanover Mennonite Church on Broadway, followed by burial in the family plot near the ancestral home. He had left instructions for the lot to be enclosed with an iron fence. A will, drawn up just weeks before his death and signed with a cross because he was too weak to write, left his entire estate to Samuel M. Bare, a distant relative and trusted friend.
The Mumma Family Cemetery, burial location of Jacob Mumma, in Hanover, York County, Pennsylvania.
After his death, the contents of Mumma’s sealed world spilled briefly into public view. Before a public auction of his belongings, a selection of his possessions was displayed at a Firemen’s Fair under the title “Museum of Antiquities.” Visitors saw a wooden human skeleton he had made himself, tin boots worn during his midnight wanderings, oil portraits painted by Mumma of himself and a woman identified as his lady-love, and shelves of manuscripts written in his own hand.
There were tools as well: a small forge, a lathe, a workbench, and a chest of watchmaker’s instruments. An unfinished clock stood silent, its dial and pendulum in place but little else completed. Three watches were set aside and never sold, including one believed to have been designed to run eight days on a single winding, another reportedly patented in London, and a third left unfinished. Mumma had promised they would never be displayed.
What became of most of these objects is unknown. One of his books of watch designs eventually found its way into the Hanover Public Library. The rest vanished into private hands, attics, or oblivion. Jacob Mumma left behind no direct heirs, only stories and unanswered questions. His life closed quietly, but the odd, subterranean world he built for himself still lingers in the imagination, a reminder that not every inventor seeks recognition and not every mystery is meant to be solved.
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Resources
- The Evening Sun Mon, Oct 31, 1955 ·Page 4
- What is York County’s Civil War buried treasure story?
- Jacob B Mumma Find-a-Grave
- Mills of York County