Progress in any branch of knowledge is intimately connected with improvements in the accuracy with which measurements appertaining to the branch of knowledge in question can be made.

The advances in electrical engineering were largely influenced by the development of measuring instruments, whereby the determination of the various quantities involved could be made with great accuracy.

The same correlation holds true in the gas industry, and progress therein is largely determined by advances made in the science of measuring the various factors and quantities involved.

Furthermore, it may be regarded as axiomatic that in every case in which an instrument is employed, additional advantages accrue if an automatic instrument, preferably a recorder of equal accuracy, can be employed.

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