On the theoretical treatment of the additional loss at the entry of a pipe through which viscous liquid flows slowly, no attempt has ever been undertaken by anyone, as far as the author's knowledge is concerned. Assuming the velocity distributions so as to satisfy the boundary conditions and equation of continuity, and treating this problem from the stand point of energy dissipation, the author succeeded in obtaining the equivalent length of additional loss at the entry Δl
i<0.444 d, and made some consideration in addition. By this result he could prove that the experimental value of the equivalent length of additional loss Δl
i=0.385 d determined by the author is not unpropriete.
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