On the relative heating powers of coke and coal in melting glass

Abstract

l,"entilation of Tunnels. 135 tonnage. The ad~,antage~ of these Lifts over common locks are great eceno. my of construction, and great saving of time and water.The time occupied in passing one boat up and another down this Lift of 46 feet is three minutes, whereas thirty minutes would be required to attain the rise el 46 feet by locks; thus the saving in time amounts to.~0ths tor beats of eight tons.The quantity of water consumed is about two tons, for eight tons of cargo, whereas in common locks it is about three tons of water per too of cargo ; the shying-is therefore 2"2 parts out of 24, or very nearly 92 per cent. If the trade were all downward, there would, by the use of these Lit~s, be carried from the lowest to the highest level ef the canal a quantity of water equal to the loads passed down.~Ir. Green stated, in reply to several questions, that in some parts of the canal it had been found impracticable to get a sufficient drain to empty the chamber~tlaey were compelled therelbre to use a half lock of 18 inches' fall; that there were seven lifts and one inclined plane on the canal, effecting