ball signal
ball signal · ball signals
A kind of mechanical signal used on early American railroads, consisting of wooden…A kind of mechanical signal used on early American railroads, consisting of wooden balls, painted various colors, that were hoisted up and down a pole using a rope and pulley.
Meaning
1 senses(historical)A kind of mechanical signal used on early American railroads, consisting of wooden balls, painted various colors, that were hoisted up and down a pole using a rope and pulley.
Forms
plural: ball signals| Singular | ball signal |
|---|---|
| Plural | ball signals |
regular