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THE ILLUSTRATED VOL. XVIII.] SUPPLEMENT, SATURDAY, APRIL 26, 1851. GREAT EXHIBITION BUILDING. v"connexion with the completion of the Great Building, there remain to be noticed a few constructive details of interest, to bring our Illustrated Record up to the period of opening this stupendous Palace of Industry." First is THE BOILER-HOUSE. For the purpose of supplying steam for the gratuitous use of exhibitors of machinery in motion," the Commissioners agreed to erect a boilerhouse within the Building, as originally designed; but, on matured consideration, it was wisely determined to keep the furnaces apart from the Building itself, and thus remove what would have been a serious cause for alarm on the part not only of the exhibitors, but also of the public at large. The Boiler-House, which is in a very forward state, is situated on the south side of Rotten-row," at a distance from the north-west angle of the Great Building of 155 feet. The whole length of the Boiler-House is 96 feet from centre to centre of columns, and the width 24 feet for it is to be observed that the principle of construction is the same as that adopted in the Industrial Palace"-cast-iron columns at intervals of 8 feet and 24 feet respectively, and 24-feet trellis-girders forming the framework of the structure, while, instead of close boarding as an inclosure, 9-inch brick walls are substituted. The Building is divided into three compartments by two cross brick walls of one brick and a half in thickness, which support a capacious cold water tank. The largest compartment, at the east end, is for the boilers, being 50 feet in length; the middle compartment, intended for stores, 20 feet and the western compartment, also for stores, 26 feet in length respectively. From the level of the ground to the top of the trellisgirders is 22 feet 2 inches. Over the boiler department the roofing will be of corrugated iron, whereas over the western division Mr. Paxton's " ridge and furrow" roofing, exactly similar to that of the Great Building, is in the course of construction. The tank is formed of cast-iron plates, bolted together by means of internal flanges, in the ordinary way. It is 21 feet square, and 4 feet 6 inches in depth; consequently will contain rather more than 551 tons of water. There are altogether five boilers, all set in brickwork: the largest one is in the middle, and is from the works of Messrs. Galloway, of Manchester, consisting of two large horizontal tubes or cylinders communieating with each other at 4 feet 10 inches from the front of the furnace, and at the other end four vertical tubes of 8 inches diameter, passing from the lower to the upper part of the boiler, and ten conoidal tubes for the same purpose; the whole length of the boiler being 13 feet, and the diameter 6 feet 4 inches. The smaller boilers, two on each side of that already mentioned, are of the high pressure multitubular construction, as used for locomotive engines, being 3 feet 8 inches in diameter, and consisting of 41 horizontal tubes, each of 23 inches diameter a cast-iron bracket is riveted to each side of the boiler, to secure it to the brick-work, the flame first acting on the bottom and sides of the boiler, which is supported intermediately by two cross walls, and returning through the tubes towards the chimney, which is fixed at the furnace end of the boiler. The chimney is constructed of iron plates, riveted together, being circular, of 16 inches clear diameter, and 21 feet high. These last-mentioned boilers are from the works of Mr. Armstrong, of Newcastle. The pipes to convey the steam into the machinery in motion" -department are of cast iron, of 8½ inches diameter internally, connected together by flanges in the usual way, and coated externally with felt. The underground channel for these pipes is formed by a foundation of 3-inch paving, on which are built dwarf 9-inch sides of brick in cement, 21 inches high, the whole being covered at top by two planks, the lower one of 4 inches, and the upper one of 3 inches in thickness respectively. WE have already described the improved construction of Ventilators, as fixed all round the external wooden inclosure of the Great Exhibition Building but, until very lately, the mode of opening or shutting the blades or luffers was not exactly determined on. We now find the shaft- [GRATIS. GOLD CHAIN AND BADGE PRESENTED TO THE MAYOR OF GATESHEAD.-(SEE NEXT PAGE.) MODE OF OPENING AND SHUTTING THE VENTILATORS. ing and apparatus in a very advanced state. The contrivance is so simple, that one man can move at least twenty-four sets of the lower Ventilators at a time. For this purpose, at a height of about 3 feet from the floor, is a small iron frame projecting from the close boarding to which it is attached. In this frame is a spindle placed horizontally, which is turned by a winch and by means of a small bevelled wheel fixed on the spindle and working into a second wheel placed horizontally, and on the top of a vertical shaft, of 3 inch diameter, with a worm near to the step fixed in the floor in which it turns, motion is given to cogged segments, fixed on the horizontal shafting as above. The segments can be moved either in one direction for opening the Ventilators, or in the other direction for shutting them. The apparatus is completed by double cranks, fixed at proper intervals, and by means of a -inch iron rod, in connexion with slight vertical arms for each set of Ventilators. The vertical arms are furnished with pivots, one to each blade, SO that the whole are moved together. THE INDUSTRIAL EXHIBITION.-THE BOILER-HOUSE, ADJOINING THE GREAT BUILDING:

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THE ILLUSTRATED

VOL. XVIII.]

SUPPLEMENT, SATURDAY, APRIL 26, 1851.

GREAT EXHIBITION BUILDING.

v"connexion with the completion of the Great Building, there remain to be noticed a few constructive details of interest, to bring our Illus- trated Record up to the period of opening this stupendous Palace of Industry." First is

THE BOILER-HOUSE.

For the purpose of supplying steam for the gratuitous use of exhibitors of machinery in motion," the Commissioners agreed to erect a boiler- house within the Building, as originally designed; but, on matured con- sideration, it was wisely determined to keep the furnaces apart from the Building itself, and thus remove what would have been a serious cause for alarm on the part not only of the exhibitors, but also of the public at large.

The Boiler-House, which is in a very forward state, is situated on the south side of Rotten-row," at a distance from the north-west angle of the Great Building of 155 feet.

The whole length of the Boiler-House is 96 feet from centre to centre of columns, and the width 24 feet for it is to be observed that the prin- ciple of construction is the same as that adopted in the Industrial Palace"-cast-iron columns at intervals of 8 feet and 24 feet respectively, and 24-feet trellis-girders forming the framework of the structure, while, instead of close boarding as an inclosure, 9-inch brick walls are sub- stituted.

The Building is divided into three compartments by two cross brick walls of one brick and a half in thickness, which support a capacious cold water tank. The largest compartment, at the east end, is for the boilers, being 50 feet in length; the middle compartment, intended for stores, 20 feet and the western compartment, also for stores, 26 feet in length respectively. From the level of the ground to the top of the trellis- girders is 22 feet 2 inches. Over the boiler department the roofing will be of corrugated iron, whereas over the western division Mr. Paxton's " ridge and furrow" roofing, exactly similar to that of the Great Build- ing, is in the course of construction. The tank is formed of cast-iron plates, bolted together by means of internal flanges, in the ordinary way. It is 21 feet square, and 4 feet 6 inches in depth; consequently will contain rather more than 551 tons of water.

There are altogether five boilers, all set in brickwork: the largest one is in the middle, and is from the works of Messrs. Galloway, of Man- chester, consisting of two large horizontal tubes or cylinders communi- eating with each other at 4 feet 10 inches from the front of the furnace, and at the other end four vertical tubes of 8 inches diameter, passing from the lower to the upper part of the boiler, and ten conoidal tubes for the same purpose; the whole length of the boiler being 13 feet, and the diameter 6 feet 4 inches. The smaller boilers, two on each side of that already mentioned, are of the high pressure multitubular construction, as used for locomotive engines, being 3 feet 8 inches in diameter, and consisting of 41 horizontal tubes, each of 23 inches diameter a cast-iron bracket is riveted to each side of the boiler, to secure it to the brick-work, the flame first acting on the bottom and sides of the boiler, which is supported intermediately by two cross walls, and returning through the tubes towards the chimney, which is fixed at the furnace end of the boiler. The chimney is constructed of iron plates, riveted together, being circular, of 16 inches clear diameter, and 21 feet high. These last-mentioned boilers are from the works of Mr. Armstrong, of Newcastle.

- The pipes to convey the steam into the machinery in motion" de- partment are of cast iron, of 8½ inches diameter internally, connected to- gether by flanges in the usual way, and coated externally with felt. The underground channel for these pipes is formed by a foundation of 3-inch paving, on which are built dwarf 9-inch sides of brick in cement, 21 inches high, the whole being covered at top by two planks, the lower one of 4 inches, and the upper one of 3 inches in thickness respectively.

WE have already described the improved construction of Ventilators, as fixed all round the external wooden inclosure of the Great Exhibition Building but, until very lately, the mode of opening or shutting the blades or luffers was not exactly determined on. We now find the shaft-

[GRATIS.

GOLD CHAIN AND BADGE PRESENTED TO THE MAYOR OF GATESHEAD.-(SEE NEXT PAGE.)

MODE OF OPENING AND SHUTTING THE VENTILATORS.

ing and apparatus in a very advanced state. The contrivance is so simple, that one man can move at least twenty-four sets of the lower Ventilators at a time. For this purpose, at a height of about 3 feet from the floor, is a small iron frame projecting from the close boarding to which it is attached. In this frame is a spindle placed horizontally, which is turned by a winch and by means of a small bevelled wheel fixed on the spindle and working into a second wheel placed horizontally, and on the top of a vertical shaft, of 3 inch diameter, with a worm near to the step fixed in the floor in which it turns, motion is given to cogged segments, fixed on the horizontal shafting as above. The segments can be moved either in one direction for opening the Ventilators, or in the other direction for shutting them. The apparatus is completed by double cranks, fixed at proper intervals, and by means of a -inch iron rod, in connexion with slight vertical arms for each set of Ventilators. The vertical arms are furnished with pivots, one to each blade, SO that the whole are moved together.

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