LECTURE NUMBER TWO
Subject—Operation
1. (a) Under what pressure is oxygen gas received in the cylinders used commercially?
(b) Does this pressure vary to any great extent with changes in temperature?
2. (a) Under what pressure is acetylene gas received in the cylinders used commercially?
(b) Does this pressure vary to any great extent with changes in temperature?
3. (a) In setting-up apparatus for the first time, or in attaching regulators to new cylinders, what precaution should be observed regarding cross-bar on regulators before the gas is turned on?
(b) Where should the operator stand when turning on the gas?
4. (a) How much pressure should be placed on the oxygen hose, when the torch-valves are closed, before starting to operate with a medium-sized tip?
(b) How much pressure should be placed on the acetylene hose, when the torch-valves are closed, before starting to operate with a medium-sized tip?
5. (a) After both the oxygen and acetylene gases are in the line hoses as far as the torch, which valve on the torch is opened first in order to light?