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Title: Basic Principles Of Instruments
Author: Edgar E. Buxton
Source: 1971 Appalachian Gas Measurement Short Course
Year Published: 1971
Abstract: Instrumentation usually starts with measurement. Many types of measurements utilize the elastic properties of materials. For instance, a spring can be used to measure weight. If a weight is attached to the end of a spring supported from a fixed point, the point of attachment lowers. Any arbitrary scale may be used to make a measurement. It can be in inches, centimeters, feet, yards, grams, ounces, pounds, etc., as illustrated in Figure 1. The familiar length scales and their subdivisions are defined by weights and measures standards. For a scale to have meaning (he spring must be calibrated with weights of known mass. A scale factor is thus determined such as pounds per inch or grams per centimeter.

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