174 
MAURICE G. MEHL 
not be annoying. Especially is this true in that the substitute 
design requires fewer operations. All are mechanically simple 
and require but a few operations. They are in a very real sense 
self-explanatory and logical, and are of such a nature as to be 
reproduced readily on either large or small scale. 
The Inadequate Test’’ symbol of figure 3 illustrates the type 
of variation from the generalized ^^dry hole” symbol which per- 
mits the indication of a large number of details. By the sub- 
stitution of such letters as W, C, and N, details like water 
sand,” close sand,” ^^no sand,” etc., are recorded. Regardless 
of the detail indicated by the letter, the essentials are the same — 
a nonproducing well in which neither oil nor gas was encountered 
in appreciable quantities. 
Frequently it is desired to distinguish between wells producing 
at different horizons. It has been the writer’s experience that 
this and similar data can be shown with less confusion by placing 
a Roman or an Arabic reference numeral against the regular 
symbol than by the use of special designs such as have been 
suggested. 
