“Jacob Staff” and Measurements of Stratigraphic Sequences: (Theoretical treatment): GEOLOGICAL NOTES
Jorge Alberto Broggi · AAPG Bulletin · 1946
The use of the Jacob staff, as stated here, is not a simple matter. There are many limitations according to the strata and ground dips. All cases are considered here and given the mathematical solutions. In measuring a big sequence, it is necessary to draw a profile sketch, in which we fix the points of changing strata or ground dips and so avoid any duplication of measures.