It affords facilities for the transport of logs by means of booms above Minneapolis, and is navigable below St Paul; being half a mile broad where it reaches the border of the state at Hastings.
The completion of the latter line precipitated one of the most extraordinary of American railway wars and land booms, which resulted in giving southern California a great stimulus.
The girders are of the Whipple Murphy type, but with curved top booms. The bridges.
In bottom booms and diagonals, 6 o tons in top booms, 5.
For practical purposes it is accurate enough to consider the booms or chords as carrying exclusively the horizontal tension and compression and the web as resisting the whole of the vertical and, in a plate web, the equal horizontal shearing forces.
The majority of bridges not of great span have girders with parallel booms. This involves the fewest difficulties of workmanship and perhaps permits FIG.
From the pivots of booms which have a total length of 34 in.
With these, or even with booms half the above length, actuating indices arranged as shown in fig.
At Rocca di Papa near Rome there is a pair of horizontal pendulums with booms 8 ft.
The term is also used of structures resembling these articles, especially of the framework of booms, spars and netting forming a protection for a warship against torpedo attack.
The Mississippi river above Minneapolis is made to serve, by means of a series of extensive log-booms, as the principal source of supply to the great saw-mills, of which there are here some of the largest in the world, with a combined capacity of 3,500,000 ft.