Way to a more economical construction known as doubles, double-ended, or "through" retorts.
The population more than doubles Gibbon's estimate of 120 millions for all the races and nations which obeyed imperial Rome.
To increase the number of doubles, ewes are sometimes put on good fresh grass, rape or mustard a week before the tups go out - a ram to sixty ewes is a usual proportion, though with care a stud ram can be got to settle twice the number.
Pursuing an easterly course, this stream receives the waters of the romantic `Ain Fije (which doubles its volume), and bursts out by a rocky gateway upon the plain of Damascus, in the irrigation of which it is the chief agent.
The dotted curve represents the superposition, which simply doubles each ordinate.
All hedges on banks, banks and doubles must be ridden at slowly; they are usually of such a size as to make flying them impossible, or at least undesirable.
The pace of advancement in the field of robotics and nanotechnology roughly doubles every couple of years.
The cost of their imported food doubles, and I guarantee you the foreign-owned factory won't double wages as a result.
He lets one win the singles and collahs it as soon as one doubles it; gives the singles and snatches the doubles!