Coal Cutter

A mechanical machine used to undercut a coal seam ahead of extraction, replacing the hand pick as the standard way of loosening coal from the face.

Historical usage

For most of the 19th century, coal was undercut and broken down entirely by hand, a hewer lying or kneeling in a seam sometimes barely a metre high to chip away at it with a short-handled pick. The earliest mechanical coal-cutters -- rail-mounted disc cutters built to the Gillott and Copley patent of 1868 -- were powered by compressed air piped from the surface, but lost effectiveness as workings extended further from the shaft and pressure dropped along the pipe run. Electric cutters followed from the 1880s-90s -- an early UK attempt in 1887, with T. B. A. Clarke's electrically driven conversion publicly demonstrated in 1894 -- using a rotating chain fitted with cutting picks, working on the same principle as a giant chainsaw, to cut a groove sometimes over a metre deep along the base of the seam. After nationalisation in 1947 the National Coal Board invested heavily in mechanised longwall faces, and the electric shearer -- a machine with rotating drums studded with hardened steel picks, travelling the length of the face -- eventually replaced the standalone coal cutter entirely.

How it worked

Early machines drove a chain or rotating disc, fitted with small cutting picks, into the base of the seam to cut a continuous groove; once undercut this way, the coal above could be brought down far more easily -- by wedges, explosive shot-firing, or simply its own weight -- than if it had to be broken out entirely by hand.

Why it was used

Mechanical cutting let a single machine do the work that would otherwise occupy several hewers, and turned coal-getting into a task that could keep pace with the growing capacity of steam and, later, electric winding and haulage -- production that nineteenth-century hand methods, producing a few tonnes a shift, could never have matched.

Risks & limitations

Coal-cutting machinery introduced hazards distinct from hand working -- most notably the trailing power cables that fed compressed-air and, later, electric machines, which could be damaged by falling material or the cutter's own movement and, if re-energised while damaged, ignite gas that had accumulated nearby.

Mines associated with this term

Included only where MineArchive's own research gives a reasonable evidential basis — not every mine where this might plausibly apply.

• New Fancy Colliery — Gloucestershire (well documented example)
  New machinery introduced included, by local report, the first compressed-air coal cutters in the district.
• Wyndham Western Colliery — Bridgend (well documented example)
  Introduced the 'Samson Stripper', a hydraulically driven, chisel-headed coal cutter, around 1950.

Disasters associated with this term

Included only where MineArchive's own research gives a reasonable evidential basis, with the nature of the relationship stated — not every disaster where this term might plausibly apply.

• Markham Colliery explosion, 1937 (contextual relationship)
  Named twice in this record, first in the cause: “A roof break near the coal cutter released trapped firedamp; a faulty replacement cover plate on the…”

Sources

1. (primary) An advertisement for Gillott and Copley Patent Rotary Coal-Cutting Machine — Historic England
2. (primary) From Picks to Shearers: The Evolution of Coal Cutting in British Mines — National Coal Mining Museum for England

Record created: 31 August 2026 · Last researched: 31 August 2026