The prin ciple of the modern automatic sight is made clear in figs.
The essential change from the link and pin to the automatic coupler is in the outboard end or head of the draw-bar.
These latter pass to automatic weighing machines, which drop them, in quantities of 1 cwt., into wooden boxes of uniform measurement, made to contain that weight; and the boxes are then conveyed to the storehouse, ready for sale.
- Automatic Coupling for Freight Cars (U.S.A.).
The Murray automatic system was designed specially for dealing with heavy traffic on long lines.