| Show A very larga luna A chemical lung esthe latest thing proposed for tho ventilation of tunnels it was lately tested in london by fourteen scientists A room was kept for an hour at a temperature of 82 decrees and tho air was loaded with impurities puri ties the men of science were now called upon to enter and the air was made still more impure by burning sulphur and carbonic acid gas then the chemical lung or so called measuring was set in motion abo temperature was soon reduced to 65 degrees and the air freed from all impurities then tat was burned to test the machine for organic substances and the lung was started up just in time to prevent tho examining gentlemen from running out tor fresh air it is proposed to uso tho invention daring the construction of the channel tunnel |
