Cowden Furnace

Overview

A Wealden iron furnace at Cowden, on the Kent-Sussex border, part of the district's long-running charcoal blast-furnace industry. A furnace here is recorded from the later sixteenth century, was ruined by the mid seventeenth, and was bought and revived in 1741 by the London ironmonger William Bowen, who cast ordnance here for the Board of Ordnance through the mid-eighteenth century until his death in 1771. Its surviving 16th-century mill building and furnace pond bay, straddling the Kent/Sussex boundary, are listed.

History

Cowden lay within the historic Wealden iron-founding district, and a furnace here is named among Kent's ironworks from the later sixteenth century — an iron furnace at Cowden is recorded in 1574 and 1588, and may have been established by John Tichborne (a mill on the site was 'proved' in 1556); early ironmasters named in connection with Cowden include Quyntyn and Michael Weston, though without precise dates. That furnace was ruined by 1664. William Bowen, a London ironmonger who had run a foundry in Southwark for nearly twenty years, purchased the freehold of Woolcoombs Farm, Cowden — of which Cowden furnace was part — in 1741, reviving ironworking at the site. Bowen worked Cowden alongside a second furnace at Barden, near Bidborough, and supplied guns to the Board of Ordnance from both through the 1750s and 1760s; by 1768 it is likely that only Cowden remained in blast. John Fuller, of the prominent Wealden ironfounding family, rated Bowen 'the best Molder among us' in 1744, and Bowen continued to cast for the Board even after the Carron Company's aggressive 1764 price cut drove most other Wealden gunfounders out of the government market — one of only a handful still supplying guns cast out of ore by the end of the 1760s. He also cast in bronze, probably at his Southwark works. William Bowen, latterly described as 'of Tonbridge', died in 1771; he is the last known owner of the Cowden site, which probably ceased work on or shortly after his death, consistent with the broader collapse of Wealden gunfounding once peacetime demand and Carron's cheaper coke-smelted competition took hold — no furnace remained in blast anywhere in Kent by 1796.

Workings

A conventional Wealden charcoal blast furnace, with an associated mill building (Furnace Mill) that may have doubled as a boring mill for cannon, and an ore/gun-quarry or sandstone quarry adjacent to the pond. An estate map of 1748 marks the furnace, a 'boring house' and a 'workhouse' on the site.

Closure

William Bowen, the last known owner, died in 1771; the furnace probably ceased work at or shortly after his death, part of the general collapse of the Wealden charcoal iron industry in the face of coke-smelting competition and the end of Seven Years' War government demand — no furnace remained in blast in Kent by 1796.

What remains

Furnace Mill House, a much-altered and restored 16th-century timber-framed mill building with later red-brick ground floor, survives and is Grade II listed. The furnace pond bay, around 125 m long and 5 m high, remains in water on Furnace Lane, and is bisected by the Kent/Sussex county boundary. The furnace site itself is now occupied by a small outbuilding; slag has been found in the millhouse garden, and cannonballs — the 'Cowden Gun', a cannon discovered nearby around 1850-60 — have been dug up in the vicinity.

Abandoned workings can be dangerous — unstable ground, uncapped shafts, flooding and bad air are common even where a site looks safe from the surface. This entry describes history and general location only; it is not an access guide.

Recorded claims

Individual factual claims, each attached to the source(s) that support it below. Where sources disagree, both are kept.

• An iron furnace at Cowden is recorded in 1574 and 1588, possibly established by John Tichborne (a mill on the site was 'proved' in 1556); it was ruined by 1664. Early ironmasters named in connection with Cowden's furnaces include Quyntyn and Michael Weston, though without precise dates in the surviving record. (uncertain) ^1,2
• William Bowen, already an established London ironmonger, purchased the freehold of Woolcoombs Farm, Cowden — of which Cowden furnace was part — in 1741, reviving ironworking there. ³
• Bowen supplied cast-iron ordnance to the Board of Ordnance from Cowden (and from his second furnace at Barden) through the 1750s and 1760s, and was one of very few Wealden gunfounders still able to supply guns to the Board after the Carron Company's price cut of late 1764. John Fuller described him in 1744 as 'the best Molder among us'. ³
• William Bowen, described latterly as 'of Tonbridge', died in 1771 and is the last known owner of the Cowden site, which probably ceased work at or shortly after his death; no furnace remained in blast anywhere in Kent by 1796. ^3,2
• Furnace Mill House, a 16th-century timber-framed mill building later much altered and restored, survives and is Grade II listed; the furnace pond bay (about 125 m long, 5 m high) remains in water on Furnace Lane and is bisected by the Kent/Sussex county boundary. ¹
• A 1748 map of the site marks the furnace itself alongside a 'boring house' and a 'workhouse', consistent with the mill's possible use for boring cannon. ¹

Sources

1. (primary) Building record TQ 43 NE 1 - former site of Furnace Mill, Cowden — Kent County Council Historic Environment Record
2. (secondary) The Iron Industry of the Weald — Kent Archaeological Society
3. (secondary) The Iron Industry in the Weald in the Period of the Seven Years' War, 1750-1770 (M.A. dissertation) — Jeremy Spencer Hodgkinson, University of Brighton (1993), via the Wealden Iron Research Group

Record created: 26 August 2026 · Last researched: 26 August 2026