根据黄万里先生的传记等材料，黄万里先生博士论文中提出的“瞬时单位线”设想领先于水文学中著名的纳什瞬时单位线19年。黄先生自己的学术著作与论文中，似乎没有引用与提及他的博士论文成果。

      然而，根据黄万里先生博士论文本身，确实是有明显的“瞬时单位线”理念，黄先生使用的词语是“瞬时过程线”。现摘录该篇博士论文中有关定义如下：

      博士论文标题：THE ANALYSIS OF THE RAINFALL- RUNOFF CORRELATION(1935)（降雨—径流的相关分析）

   第2部分  II - Drainage Area Characteristics（见于page 12）

       5. The Theory of instantaneous Hydrograph                      

    An instantaneous hydrograph is one due to an instaneous rainfall falling over the drainage area above the section of river where the discharge measurements are made. Interpreted mathe matically, an instantaneous rainfall means that its duration approaches zero as a limit.

   Consider a uniform rainfall of  unit intensity, say, one inch per day, covering the entire drainges area and falling in an infinitesimal time. dt. assume that there is no water lost throughout its trip to the outlet so that all rainwater is drained from the surface of the watershed. consequently, the rute of rainfall excess is equal to the intensity of rainfall. Following such an instantaneous rainfall, the hydrograph representing the flow in the main stream channel shows the run-off  increasing to a maximum value and then subuilding to the value it had before the storm.