A massive collection of sinister looking implements was growing—tools of their trade, all apparently necessary in order to remain aloft when maneuvering up or down perpendicular columns of frozen water.
They remained in place for 20 minutes, occasionally exchanging a shouted comment, but mostly looking up or down at each other, self-consciously.
The derrick crane introduces a problem for which many solutions have been sought, that of preventing the load from being lifted or lowered when the jib is pivoted up or down to alter the radius.
The importance of the bounding line of the graph lies in the fact that we can keep it unaltered while we alter the graph as a whole by moving OX up or down.
It gives shelter not only to vessels plying to its adjoining ports but serves as a harbour of refuge for shipping bound up or down the Atlantic coast, and is fre q uently used for the assembling of naval fleets.
