The issues of work and pressure during rolling, obviously related to one another, have long been the subject of research, both theoretical and experimental. The number of large experimental studies devoted to these issues is small. For my part, I will dwell only on those conclusions of other researchers that the course of my research leads me to consider (see article). Kodron's theoretical research was accompanied by laboratory experiments on rolling lead bars between rollers of small diameter. I will dwell somewhat on these experiments in the future, since it was these experiments that first of all gave me the opportunity to verify the correctness of the theoretical formulas I had derived.