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Title: Charts, Pens And Ink
Author: Douglas Eberhardt
Source: 1993 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1993
Abstract: How did the recording chart evolve to its present state? There are many factors which contributed to the design of the circular recording chart. The charts size, shape and arc lines are varied with each instrument manufacturer. The original paper and printing inks used to produce recording charts were based on the state-ofthe- art technology. These materials varied widely from manufacturer to manufacturer. When a printing company evaluates paper, there are a multitude of factors that must be taken into account. The paper companies manufacture their products from trees, and not every tree is alike therefore, not every paper company prepares or processes their paper in the same manner with regard to furnish, opacity, finish, tear and tensile strength, ink penetration or sizing, and dimensional stability. The printing media (paper) will be dimensionally affected by humidity and temperature based on the site of usage ex. Alaska vs. Gulf Coast).

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