The actual body of the work looks well done; however, the introduction (written in 1975 -- how well I remember!) stumbles a bit at the end.
While I hope that the reader of The Medieval Machine will want to pursue his own comparisons, I must point out one alarming contrast. The economic depression that struck Europe in the fourteenth century was followed ultimately by economic and technological recovery. But the depression we have moved into will have no end. We can anticipate centuries of decline and exhaustion. There will be no further industrial revolution in the cycles of our Western civilization.
I'm so glad that smart people are sometimes doofuses.