Steam Horse locomotive

Brunton's Mechanical Traveller I

Brunton's Mechanical Traveller

Type and origin Power type Steam Builder William Brunton Build date c. 1813

Specifications Configuration Four wheels, not driven Loco weight 2 ^1⁄4 long tons (2.3 t; 2.5 short tons) Boiler pressure 40 lbf/in^2 (280 kPa) Cylinders 1 Cylinder size 6 in × 24 in (152 mm × 610 mm)

Performance figures Maximum speed 3 miles per hour (4.8 km/h)

Career Operators Butterley Ironworks

Brunton's Mechanical Traveller II

Type and origin Power type Steam Builder William Brunton Build date October 1814

Specifications Configuration Four wheels, not driven Loco weight 5 long tons (5.1 t; 5.6 short tons) Cylinders 1 or 2

Performance figures Maximum speed 2.5 miles per hour (4.0 km/h)

Career Operators Newbottle Colliery Retired 31 July 1815 Disposition destroyed by boiler explosion

The Steam Horse was constructed by the Butterley Company in Derbyshire in 1813 by William Brunton (1777–1851). Also known as the "Mechanical Traveller" it had a pair of mechanical legs, with feet that gripped the rails at the rear of the engine to push it forwards at about three miles an hour.

Design

To modern readers it may seem a comical contraption, but it provides an interesting insight into railway thought at the time. The collieries were well served between towns by the canal system. From the pit head to the canals, horse-drawn wagonways had been constructed and steam engines were seen as no more than a noisy and dangerous novelty. However the Napoleonic Wars from 1799 to 1815 had brought a great increase in the price of fodder. Moreover, some such "railways" were being constructed on the steeper gradients within canals, as for instance on the Charnwood Forest Canal.

Nobody believed that steel wheels on smooth steel rails would give enough adhesion until Stephenson and Hedley proved otherwise in 1813 and even the former considered 1 in 100 (1%) was the absolute maximum grade. Consequently such steam operated systems as there were, were operated by cumbersome cables, or by the use of an expensive rack and pinion.

Crich

This makes Brunton's idea seem more reasonable, given that the Butterley Company were faced with a gradient of 1 in 50 between its Limestone quarry at Crich to the Cromford Canal at Amber Wharf, some 1.25 miles (2.01 km) away. Brunton took out a patent, No. 3700, dated 22 May 1813 for the locomotive.^[1] The Butterley locomotive cost a total of £240.^[2]

Newbottle

The historical record is scanty but it seems that the Steam Horse operated successfully for an unknown period. So much so, that another, larger, one seems to have been built for the Newbottle Colliery, in County Durham. This locomotive cost £540 and may have had two cylinders.^[3] During 1814 and 1815 it hauled loads up a 1 in 36 gradient at 3 miles per hour (4.8 km/h), but the colliery owners were not happy with it. On 31 July 1815,^[1] during a demonstration, the new wrought iron boiler exploded, killing thirteen spectators and injuring several others, and the idea was not pursued.^[4][5] This incident was the first recorded railway disaster.^[1]

References

1. "Brief Biographies of Major Mechanical Engineers". Steam index. Retrieved 2008-03-22.
2. "Pre-1825 locomotives - 2". Locos in Profile. Retrieved 2008-03-22.
3. "Pre-1825 locomotives - 4". Locos in Profile. Retrieved 2008-03-22.
4. "Bruntons In History". Lord Brunton online. Archived from the original on 2007-09-28. Retrieved 2008-03-22.
5. "Curiosities of Locomotive Design". Catskill Archive. Retrieved 2008-03-22.

• Loughnan St. L.Pendred (1921) A Note on Brunton's Steam Horse, 1813,Transactions of The Newcomen Society 02 (1921) : 118-120 available on line