Closely connected with the manufacture of lumber is the making of paper and wood pulp, centralized at Bellows Falls, with waterpower on the Connecticut river and with the raw materials near; the product was valued in 1905 at $3,831,448.
The principal railways are: the lines operated by the Boston & Maine system, extending along the eastern border from Brattleboro through Bellows Falls, and St Johnsbury to the Canada boundary (Vermont Valley, Sullivan County, and Connecticut & Passumpsic Rivers railways), with a line, the St Johnsbury & Lake Champlain railway, extending across the northern part of the state from Lunenburg to Maguam Bay; the Central Vermont railway (Grand Trunk system) which crosses the state diagonally from S.E.
To N.E., connecting Burlington, Montpelier and St Albans and affording connexion to the north with Montreal and to the south over trackage shared with the Boston & Maine, with the New London Northern which is leased by this road, and the Rutland railway (New York Central system) extending along the western edge of the state and connecting Rutland with Burlington to the north and with Bellows Falls and Bennington to the south.
The disk being started, then by means of a tube held at one end between the lips, and applied near to the disk at the other, or more easily with a common bellows, a blast of air is made to fall on the part of the disk which contains any one of the above circles.
Thecurrent being alternately transmitted and shut off, as a hole passes on and off the aperture of the tube or bellows, causes a vibratory motion of the air, whose frequency depends on the number of times per second that a perforation passes the mouth of the tube.
Are immediately above those in the fixed plate, and let the bellows by which air is forced into the cylinder (air, for simplicity, being supposed to be the fluid employed) be put in action; then the air in its passage will strike the side of each opening in the movable plate in an oblique direction (as shown in fig.
The Bellows Falls bridge over the Connecticut (built 1785-1792) had 2 spans of 184 ft.
The laboratory form in common use consists of a bellows worked by either hand or foot, and a special type of gas burner formed of two concentric tubes, one conveying the blast, the other the gas; the supply of air and gas being regulated by stopcocks.
Not content to let it burn by natural draught, he would blow it with his own breath, would expose it to the prevalent wind, would urge it with a fan, and would devise the first crude valveless bellows, perhaps the pigskin already familiar as a water-bottle, of which the psalmist says: I am become as a bottle in the smoke."
If his bellows had only a single opening, that through which they delivered the blast upon the fire, then in inflating them he would draw back into them the hot air and ashes from the fire.
While inflating the bellows he would leave the suction port open and close the discharge port with a pinch of his finger; and while blowing the air against the fire he would leave the discharge port open and pinch together the sides of the suction port.
It is of the familiar type of the replacing of the simple but wasteful by the complex and economical, and it was begun unintentionally in the attempt to save fuel and labour, by increasing the size and especially the height of the forge, and by driving the bellows by means of water-power.
The rapid advance in mechanical engineering in the latter part of this second period stimulated the iron industry greatly, giving it in 1728 Payn and Hanbury's rolling mill for rolling sheet iron, in 1760 John Smeaton's cylindrical cast-iron bellows in place of the wooden and leather ones previously used, in 1783 Cort's grooved rolls for rolling bars and rods of iron, and in 1838 James Nasmyth's steam hammer.
77), and at the siege of Delium (424 B.C.) a cauldron containing pitch, sulphur and burning charcoal, was placed against the walls and urged into flame by the aid of a bellows, the blast from which was conveyed through a hollow tree-trunk (Thuc. iv.
When there were several bands of musicians, it sounded as if all the village was a vast bellows and all the buildings expanded and collapsed alternately with a din.