Johnson, Clapham & Morris miner's Davy lamp

Made:
1880 in United Kingdom
Johnson, Clapham & Morris miner's Davy lamp, c. 1850
Photographed straight on view on a white background. Johnson, Clapham & Morris miner's Davy lamp

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Johnson, Clapham & Morris miner's Davy lamp, c. 1850 Photographed straight on view on a white background.
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Johnson, Clapham & Morris miner's Davy lamp
Science Museum Group
© The Board of Trustees of the Science Musuem

Miner's 'Jack Davy' safety lamp, made by Johnson, Clapham & Morris, c. 1880.

This lamp is fitted with a gauze covered by Johnson, Clapham & Morris's patent #3920 of 23 October 1877.

The purpose of the gauze on a Davy lamp was to disperse the heat of the flame to reduce the risk of explosions. As mines went deeper, the ventilation had to be improved and this caused increasingly strong currents of air to impinge on the gauze. This started causing explosions.

In the 1830s it was widely recognised that the Davy had to been protected from even gentle air currents. Shields were introduced surrounding two thirds of the flame (see Y2002.19.3.1). However, over time and as ventilation currents increased, the shields became more complete and complicated. By 1850, Jack Davys like this one were introduced with a glass cylinder around the lower part of the gauze.

Details

Category:
Coal Mining
Collection:
Lancashire Coal Mining Collection
Object Number:
Y2002.19.13.1
Measurements:
215 mm x 71 mm
type:
miner's oil safety lamp
credit:
Gift of Salford Museum and Art Gallery