|John's photo of the Imperial War Museum, London|
|WWI Trench markers, displayed at the Imperial War Museum, London. (Another of John's photos.)|
|Capt Cluny Macpherson in Egypt (Internet photo!!)|
The Germans first used poison gas against the Allied troops in April 1915. To combat the gas, two not very successful devices were hurriedly issued to troops. Captain Macpherson came up with an improvement on these two and invented an early version of the gas mask. His invention, the British Smoke Hood, was a canvas hood treated with chlorine-absorbing chemicals, fitted with a see through mica eyepiece. This was adopted by the British Army and introduced in June 1915.
|Forerunners of the Gas mask. (John took this picture through the glass case.)|
|Captain Cluny Macpherson's invention. (A cropped version of John's photo.)|