Millennial Stone Cleaner

Woodland Cemetery — Des Moines, Iowa

Woodland Cemetery, Des Moines, Iowa · 2022
Partner: City of Des Moines Parks and Recreation
Monument resetting · Fracture repair · Inscription recovery
Photogrammetry: Andy Perrin, I Shew You a Mystery

The Work

This white marble monument in Des Moines’s oldest cemetery had fallen, fractured, and been repaired once before. The fracture ran at a steep angle, which puts the joint in shear — adhesive alone would eventually fail. A basalt pin now carries the load across the break, bonded with knife-grade stone epoxy.

The harder problem was the face of the stone. A century of coal smoke and acid rain had dissolved the marble’s detail until the inscription was nearly gone. Working with Andy Perrin of I Shew You a Mystery, we photographed the surface and ran it through a custom photogrammetry model, pulling letterforms out of stone the eye reads as blank.

The name came back: Sophia Connell Sherman.

The Story

Sophia Connell (1818–1871) married James Sherman in Lancaster, Ohio in 1841, making her sister-in-law to General William Tecumseh Sherman, Senator John Sherman, and Des Moines’s own Hoyt and Lampson Sherman. James was the brother the famous family didn’t talk about. When his struggles sent him back east in 1863, Sophia stayed and held the Des Moines household together.

Gallery

Blank weathered marble face of the Sherman monument
The face of the stone as it reads in person. The inscription is nearly gone.
Photogrammetry render showing the recovered inscription
The photogrammetry render of the same face. The letterforms come back.
Fallen broken marble monument lying in the grass
How the monument was found. Fallen and broken in the grass.
Excavated marble slab covered in soil
One of the fallen pieces just out of the ground.
Wooden tripod and chain hoist lifting the marble tablet
A chain hoist on a wooden tripod carries the tablet back over its base.
Clamps and wood battens holding the repaired joint
The top half set back in place. Clamps and battens hold the joint in line.
Monument reset upright on its base with clamps
Reset on its base, clamps still on the joint.
Close-up of the repaired fracture line in marble
The repaired fracture up close.
Cameras on tripods around the monument for photogrammetry
Cameras set for the photogrammetry pass.