Gregory and Fostera#39;s Apparatus fitted to a Lancashire Boiler . 221 48. Front Elevation of the Gregory and Foster Consumer applied to a Babcock Boiler 222 49. Section of Babcock Boiler fitted with a Gregory and Foster Consumer 223 50.
|Title||:||Smoke abatement; a manual for the use of manufacturers, inspectors, medical officers of health, engineers, and others|