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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 inspector.

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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Adams,
Amesbury,
Amherst,
Arlington,
Athol,
Attleboro,
Beverly,
Boston,
Brockton,
Cambridge,
Charlestown,
Chicopee,
Citizens' (Nantucket),
Citizens' (Quincy),
Clinton,
Danvers,
Dedham,
East Boston,
Easthampton,
Fall River,
Fitchburg,
Framingham,
Gardner,
Gloucester,
Greenfield,
Haverhill,
Holyoke, 1
Ipswich,
Lawrence,
Leominster,
Lexington,
Lowell,
Lynn,
Malden,
Marblehead,
Marlborough,
Milford,
Natick,
New Bedford,
Newburyport,
Newton,
North Adams,
Northampton,
North Attleborough,
Norwood,
People's (Stoneham),
Pittsfield,
Plymouth,
Salem,
Spencer,
Springfield,
Suburban (Revere),
Taunton,
Vineyard (Oak Bluffs).
Wakefield, 1
Ware,
Webster,
Westfield,
Williamstown,
Woburn,
Worcester County,
Worcester,

17.37 20.30 20.20 19.62 22.16 17.21 16.55 18.10 17.06 18.28 16.93 17.45 18.66 18.25 21.91 16.21 17.94 17.75 16.19 20.44 17.96 16.62 22.48 17.48 18.43 19.61 17.74 19.30 18.20 20.75 20.00 18.31 18.11 17.40 17.65 16.47 16.87 16.32 18.80 16.49 18.63 17.56 17.36 17.39 15.78 17.43 18.42 16.33 17.08 20.67 16.52 16.89 16.94 13.43 16.95 16.86 21.57 17.04 16.90 16.80 20.66 18.38

17.9 23.2 29.5 20.8 26.0 18.0 18.1 19.6 22.0 19.3 18.2 18.9 21.3 20.0 25.9 17.2 19.5 20.0 17.6 22.3 18.6 18.0 26.4 18.9 20.3 22.1 20.1 21.2 19.8 22.8 20.0 20.2 19.3 19.6 18.1 17.5 18.2 18.7 20.2 17.7 20.0 18.8 19.2 18.4 17.4 18.3 20.7 16.8 18.1 21.7 18.1 17.9 18.4 18.2 18.0 18.0 27.7 18.0 17.4 18.3 21.7 19.7

36 41 25

2 12 7 9 25 11 29 12 12 10 7 3 16

17.1 18.3 19.9 18.3 21.0 16.3 14.3 17.0 13.5 17.6 15.7 15.2 15.2 17.5 18.9 14.5 17.1 14.6 13.8 16.8 16.6 15.1 18.6 16.2 14.6 17.1 16.6 16.8 17.0 18.8 20.0 17.2 17.3 16.3 17.2 14.5 16.1 13.3 17.6 15.0 17.7 16.1 12.9 16.4 14.4 16.9 15.6 15.3 16.2 19.3 14.7 15.4 15.1 10.6 15.6 15.0 19.3 15.8 16.5 15.7 19.3 17.2

20.50 1.
9.11 1.
6.90 1.
7.57 1.
7.78 1.
16.92
17.83

1.
18.48 1.
10.93 1.
16.32 1.
17.05
17.36 1.
12.33
19.40 1.

8.95 1. 20.80 1. 17.30 1. 19.47 21.44

7.87 1. 13.38 1. 15.53

7.23 18.19 8.81

1. 9.02 17.95 1.

5.10 1. 12.75

7.84 11.80 14.25 1. 16.66 1. 13.41 1. 18.05 1. 13.07 3.15 10.80 8.30 16.64 1.57 13.91 1.13.74 1.87 17.55

1.19.92 1.18

6.57 1.17.84 1. 15.30 1.15.30 3.20 14.10 1. 12.05 3.28 17.47 4.60

8.60 1.15.75 1. 15.01 1.18.20 1.16

8.33 1.13.36 3.27 15.60 1.30

7.26 1. 14.85 1. 21.17 1. 13.84

8.60 1. 14.47 1.

20

6 10 15 17

5 10

38

1 Municipal plant.

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12

24

Beverly,
Beverly,
Brockton,
Brockton,
Brockton,
Brockton,
Charlestown,
Chicopee,
Citizens' (Nantucket),
Danvers,
East Boston,
Easthampton,
Easthampton,
Easthampton,
Framingham,
Framingham,
Greenfield,
Marlborough,
Marlborough,
Natick,
Natick,
Newburyport,
Newburyport,
Newburyport,
Northampton,
Norwood,
Norwood,
Norwood,
Otis (Ware),
Pittsfield,
Plymouth,
Springfield,
Springfield,
Springfield,
Suburban (Revere),
Taunton, .
Taunton,
Vineyard (Oak Bluffs),
Vineyard (Oak Bluffs),
Wakefield,
Westfield, 1
Woburn,

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June 14
Dec. 21
Mar. 2
Mar. 11
Oct. 14
Oct. 28
Dec. 31
Apr. 27
Dec. 15
Nov. 2
Jan. 11
Oct. 14
Nov. 2
Dec. 23
Jan. 20
Feb. 11
Dec. 8
Jan. 13
Nov, 11
Sept. 30
Nov, 29
Jan. 12
Dec. 2
Dec. 29
Feb. 18
July 5
Sept. 24
Nov. 8
Dec. 23
Dec. 9
Nov. 9
Feb. 3
Nov. 17
Nov. 25
Mar. 1
Jan. 11
Jan. 21
Oct. 26
Dec. 15
Dec. 1
Mar. 29
Apr. 15

1 Municipal plant.

Excesses of Sulphur in Grains per 100 Cubic Feet.

(Legal maximum, 30 grains.)

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Amesbury,
Amesbury,
Amesbury,
Amesbury,
Amesbury,
Amesbury,
Arlington,
Arlington,
Athol,
Citizens' (Nantucket),
Citizens' (Nantucket),
Clinton,
Clinton,
Edison of Brockton (Stoughton station),
Edison of Brockton (Stoughton station),
Edison of Brockton (Stoughton station),
Framingham,
Gardner,
Gardner,
Gardner,
Gardner,
Gardner,
Gardner,
Gardner,
Gardner,
Haverhill,
Haverhill,
Haverhill,
Ipswich,
Ipswich,
Ipswich,
Ipswich,
Ipswich,
Lexington,
Middleborough,
Middleborough, 1

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Sept. 21 Oct. Nov. 3 Nov. 25 Dec. 6 Dec. 30 Oct. 27 Nov. 7 July 13 Oct. 25 Dec. 15 Sept. 23 Oct. 4 Sept. 20 Nov. 15 Dec. 16 Aug. 19 Feb. 3 Feb. 24 July 13 Sept. 22 Nov. 4 Nov. 16 Dec. 7 Dec. 21 Sept. 15 Nov. 10 Nov. 21 Feb. 11 Mar. 25 July 12 Nov. 10 Nov. 22 Nov. 18 Dec. 17 Dec. 28

· Municipal plant.

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