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The following table shows the number of street lights of each candle-power installed on June 30, 1910, and the average number in use throughout the year ending June 30, 1910, with the average number of days and hours the same were burned in the municipalities named:

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The following table is compiled to indicate, as nearly as may be from the data available, the cost per lamp for the year ending June 30, 1910, of the electric street lights in the municipalities named, determined by the items shown and upon the average daily number of lights used during the year, as given in Table 8. Obviously such cost is affected by the profit or loss on the commercial business. The apparent loss in operating is the difference between the operating expense and the income from private consumers. Interest is computed upon the total investment at the beginning of the year, at the rate paid upon the bonds or notes, and depreciation upon the same amount at the rate of 3 per cent. The value of electricity supplied to municipal buildings is allowed at a fair amount, as determined and stated by the respective Whenever the street lights are of different kinds or candle-powers, the total cost obtained in the manner indicated is apportioned to each kind, according to the amount of energy theoretically necessary under average conditions to maintain the lights at the standard candle-power.

managers.

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1 Gain in operating accounts.

the books.

• Depreciation less jobbing and other income received.

Interest and depreciation here stated are the same per cent. of total interest and depreciation as electric plant assets are of the total combined plant, as shown by

• Gain in operating accounts exceeds the charges stated.

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1 Gain in operating accounts.

2,136 181

3,836 543

2,828 44","

60

112 24

75

4,528 80

4 85

2,000

525

33 92

Depreciation less jobbing and other income received. Interest and depreciation here stated are the same per cent. of total interest and depreciation as electric plant assets are of the total combined plant, as shown by the books. 'Midnight lighting. All night lighting.

The towns of Middleborough, Wakefield and Westfield, and the city of Holyoke operate gas plants, the first named since Oct. 31, 1893, the second since Aug. 7, 1894, the third since June 1, 1899, and the last since Dec. 15, 1902.

The plant at Middleborough makes oil gas, those at Wakefield and Westfield coal gas, that at Holyoke coal and water gas.

During the year 1910 examinations by the State inspector for candle-power and purity were made four times in Middleborough, four times in Wakefield, eight times in Westfield and twenty-one times in Holyoke. Impurities prohibited by statute were found twice in Middleborough. The candle-power has been found below the standard once each in Wakefield and Westfield.

The average price received in Holyoke for gas sold in the year ending June 30, 1910, was $1.00 per thousand; in Middleborough, $2.76; in Wakefield, $1.29; and in Westfield, $1.29. The cost of gas during the same period, computed by the method applied to the cost of electric lighting in the table on page 193 was, in Holyoke, $0.892; in Middleborough, $5.86; in Wakefield, $1.24; in Westfield, $1.01.

INSPECTION OF GAS AND GAS METERS.

Gas Inspection.

Important legislative changes relative to the inspection of gas were made by chapter 483 of the Acts of 1909, which went into effect July 1 of that year. These were fully described in the last annual report, and all inspections during the year 1910 were made in accordance with the provisions of that act.

Following the statutory requirement that the gas shall be tested with a burner best adapted to it, which is at the same time suitable for domestic use, the Board has continued the use of the D, E and F sizes old-style and F size new-style Sugg's London Argand burner, these having been found most suitable for coal gas, low candle-power water gas and mixed gases; while for the higher candle-power water gas and oil gas the Sugg's table-top tip open burner and a small iron tip open burner have been used. For acetylene gas the Von Schwarz onehalf foot and three-quarter foot Perfection burners were used.

There were 890 inspections made during the year ending December 31, including those of gas supplied by municipal plants. Of this number, 235 were made by the chief inspec

tor.

The following tables contain the data obtained by these examinations. For convenience of comparison the oil gas and acetylene gas companies are shown in separate tables. The Amherst and Lexington companies appear in two tables because of a change during the year in the kind of gas made. In the ammonia column, 1. — means that the gas did not contain as much as one grain of ammonia per hundred cubic feet.

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