During the last few years the system of customers accounting, generally referred to as the Accounting has been steadily gaining in favor in all types of public utilities. In the telephone accounting field it is almost the universal system. Among gas and electric utilities it has been adopted by the majority of companies billing over 7500 accounts per month. Recent surveys among water utilities have shown a definite trend toward the adoption of this plan during the past three years in preference to other methods of handling the customer accounting work. Of course, this is more generally true among companies which have changed from their former hand method to mechanical methods of bookkeeping and billing, although many have changed to Stub Plan from other plans which utilized mechanical equipment. Although the stub plan has been successfully used on the hand method, the development and application of mechanical equipment to the customer billing work has no doubt been responsible for the increased use of this plan. Several types of machines have been developed which can more economically handle the complete billing and debit posting job, using stub plan, than if other plans were adopted. The following figures are of interest in showing the extraordinary growth of the number of stub plans in use among water utilities for the period prior to December 31, 1927, and the last three years. A survey of 221 water utilities using mechanical methods of billing showed that 76 percent were using Bill and Ledger Plan as of December 31, 1927; 22 percent used Stub Plan, and 4 percent used Register Sheet Plan. During the period from 1927 to 1930 inclusive, 192 water utilities adopting mechanical methods of billing for the first time, 45 percent of the installations were the Bill and Ledger Plan, 54 percent the Stub Plan and 1 percent the Register Sheet Plan. Therefore out of a grand total of 415 companies we find that 61 per-
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