There were 979 inspections made during the year, including those of gas supplied by municipal plants. Of this number, 275 were made by the chief inspector.
The following tables contain the data obtained by these examinations. For convenience of comparison the companies are divided into three classes, those having five inspections or more during the year, those having less than five, and the oil gas companies. In the ammonia column, 1. - means that the gas did not contain as much as one grain. When this fact developed, the examination was suspended.
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