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IF it was built in 1936 and you have a ton of "S" traps you may have a whole house trap in the basement. Originally houses couldn't actually have that many lead bends to make what we now see. The entire house would be trapped in the basement with a vent leading typically out the wall near the front of the house. Whole house traps are no longer permitted as well as "S", crown and drum traps.
Air admittance valves are permitted pretty much anywhere anymore but cannot be concealed within walls or ceilings etc. As well, you could typically eliminate the "S" and as long as the part after the lowest part of the trap is 2 X the size of the first bend of the "S" it's now a "P"
Not a plumber btw and didn't stay at a Holiday Inn.... codes guy doing commercial plans examining and inspection of all trades.
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