Since this energy is located in a cylinder of height , then the energy quantity falling upon in this direction is:
Previously (§ 1) we saw, that from the incident radiation , the fraction is absorbed, while the fraction is transformed into work. Thus from the totality of the incident energy quantity, the fraction is absorbed and the fraction is transformed into work.
Thus from the just incident energy quantity, the fraction
is absorbed; the fraction
is transformed into work.
In a similar way one recognizes, that the energy quantity
falls upon , and that we have to multiply this energy quantity with and respectively, to obtain the fraction of them