Author of "The Lund Hill Mode of Ventilation; and "Practical Treatise
on Gases, Explosions, Ventilation, and the Workings of Mines."

St. Helens, March 14, 1864,

The undermentioned persons have examined the Plans, &c., connected with the
work, and have unanimously pronounced them to be of great practical
utility, and the work to be one which has hitherto been much needed by Miners at
large.

ABEL HEYWOOD AND SON, 56 & 58, OLDHAM STREET.