DIY: How to level a uneven, wavy, or sloping wood floor

PLEASE READ before you ask why I didn't just fix the foundation, beams, or joists. There was a brick chimney estimated to weigh about 2200 pounds that was sitting directly on the floor and was unsupported from underneath. The house was built in 1916 and over the years, the large 8-10" hardwood carrying beams, joists, and two layers of perpendicular subfloor planks all warped under the weight. I removed the chimney and jacked up the house, replaced the footer and concrete block perimeter foundation, but the curvature of the beams could not be straightened, and there is only a small crawlspace underneath to work. The floor is now supported from below with concrete and posts, but I needed to correct the warping above WITHOUT SPENDING an enormous amount of time and money rebuilding the structure. If I wanted a perfect like new house, I would have rented and excavator, destroyed and buried this one, then built a new one. It would have been less work. This, however, has worked perfectly for my needs. Cheap and fast, and the structure is no less rigid after adding supports below. I uploaded this only because I could find no other methods on Youtube. It may not be the best way, but it is working out great. I'm using a level, screws, and scribing tool to level an uneven wood floor.