Re: 2 switches / 1 box, knob and tube
One of the problems with K&T is that sometimes switches are switching neutral rather than hot. It makes it a little more difficult to trouble shoot. In the old box you had 3 wires, one wire went to both switches (a jumper) the other two wires went to the light. That wire that goes to both switches should be connected to the jumpered screws on the double switch and the other wires to the unjumpered screws.
Be sure you live your life, because you are a long time dead.-Scottish Proverb