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by the Bigelow Company. Fig. 64 is a front elevation; Fig. 65 a ground plan of the brickwork; Fig. 66 a longitudinal sectional elevation; Fig. 67 a sectional end elevation; the dimensions of the setting being given in the table on page 176.

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"At present it appears as if the Lancashire, or double-flued boiler, would supersede all others for stationary purposes, and it has fairly earned its reputation as a sure and safe steam generator when constructed in a proper manner, and set with due regard to cleanliness, dryness and efficient inspection. We shall pass over the method of setting cylindrical boilers upon a mid-feather wall, as the plan is radically bad. First, it

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Measurements for Setting Return Tubular Boilers with Arch Fronts.

WALLS.

FURNACE.

SETTING.

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Bottom of Fronts should set up five inches above floor level (which is two courses of brick). Front edge of moulding on bottom of front should set back two inches from front edge of brick. All measurements are based on the Front being set as stated above. Ash pits under the grates should slope down from bottom of ash door to the floor level. Rollers and plates go under the rear brackets only. The front brackets rest down on the wall without plates or rollers. Inside walls should commence to taper from top of grates to a line five inches under the brackets to give a space of four inches between side of boiler and wall. The piers directly under the brackets should be carried up straight and should be four inches wider than the bottom of the bracket, giving a good surface for the bracket to rest on.

The inside walls should close into the boiler on a line five inches under the brackets, which is two courses of brick. The outside and inside walls all have an air space of three inches between them and should have headers run from wall to wall every eighteen inches, but not tied together.

Fire brick in the furnace should be laid with a course of headers every five or six courses, so that the wall can be easily taken out and repaired at any time..

brings the weight of the boiler upon one line; secondly, it favors the tendency to corrosion, promoted by possible dampness in the seatings, where the side wall would not do so.

"We now describe and illustrate the setting of the Lancashire boiler on the best modern principles, and give a method of finding several of the required dimensions from the intersection of certain lines of construction which, we believe, has not been before published. It is applicable to the Section on AB, Fig. 71.

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Lancashire boiler of any diameter, from 6 feet to 7 feet 6 inches, these being about the minimum and maximum diameters respectively of such boilers. It may also be used for Cornish boilers below 6 feet in diameter, but with a modification in the case of small diameters, so as to keep the bottom flue not less than 2 feet deep, for when this depth is less than 2 feet inspection becomes inconvenient.

"Referring to Fig. 68, draw the circle of the boiler, which is in this

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