foundation is usally concrete or in that time period probally stone block, the house sits on top of it so you have clearence underneath to acess the underside of the home in case of plumbing or heating repairs, or wiring (depends on the home and year built), theres alot of older homes in my town that sit on blocks under the beams and there tilting badly from the years, judging from the year on your home does it have a basement?
edit... id love to get my hands on that home as far as drawning the Cad work for the remodel, that homes a beauty, i just bought a home built in 1936 it was an old millwrights home, outer walls are 10" interior are 8 inch, all the wood is demensional, glass doorknobs, old doors, sweet little home i love it