Kennedy Patent Water Meter Co. Ltd (est. 1863, Kilmarnock, Scotland) was one of the earliest and most important water‑meter manufacturers in the world, founded to commercialise Thomas Kennedy’s 1852 patented piston water meter.

In 1899, it merged with Glenfield Co. Ltd to form Glenfield & Kennedy Ltd, which became the largest hydraulic engineering firm in the Commonwealth.

🧭 Origins & Founding (1824–1863)

Thomas Kennedy (senior) was a watchmaker who moved to Kilmarnock in 1824, he recognised the need for accurate water measurement as urban water systems expanded.

Working with clockmaker John Cameron, he developed a piston‑type water meter directing water alternately above and below a piston in a fixed‑volume cylinder — achieving ~1% accuracy, exceptional for the era.

This design was patented in 1852.

Formation of the company (1863)

To commercialise the invention, a syndicate formed Kennedy Patent Water Meter Co. Ltd in 1863, located on the former Glenfield Printing Works site.

This company manufactured and marketed Kennedy’s patented meter.

🏭 What Kennedy Actually Manufactured

1. Kennedy Piston Water Meter (1852 design)

- The core product was a single‑piston, double‑acting water meter:

- water directed alternately above/below a piston

- fixed cylinder volume

- piston motion drove recording dials

- accuracy ~1%

2. Improved piston meters (1870s–1890s)

Patents by Thomas Kennedy Jr. (1877) show continued refinement of the mechanism.

3. Meter castings & assemblies

The Glenfield Co. (founded 1865) produced castings for Kennedy’s meters until the merger.

🧱 Growth & Merger (1899)

In 1899, Kennedy Patent Water Meter Co. Ltd merged with Glenfield Co. Ltd to form - Glenfield & Kennedy Ltd

This merged company rapidly became:

- the largest hydraulic engineering firm in the Commonwealth

- a major exporter of water meters and hydraulic equipment worldwide

- supplier to major waterworks (e.g., Whitehaven 1891, Addington 1893)

- Kennedy’s meter remained a core product into the early 20th century.

🧭 Leadership & Expansion

Thomas Kennedy Jr. (1871–1904)

He directed both companies and oversaw:

- expansion of meter production

- diversification into hydraulic machinery

- workforce growth into the hundreds

- development of specialised machinery and stationary engines 🧭 Later History & Legacy

After the merger, Glenfield & Kennedy:

- established subsidiaries (British Pitometer Co., Hydrautomat Ltd)

- expanded into valves, hydrants, pumps, cranes

- continued meter production into the 20th century

- was acquired by Biwater in 1985

- today survives as Glenfield Invicta, part of AVK Group