Baseball foul line painting tool - GIF

[Jon]

Baseball foul line painting tool. Had no idea!




Previously:

How a baseball is made - GIF
Physics of baseball/bat collision - GIF
Court line taping machine - video

[ranald]

How is the guide line done for that to follow?
Much more professional & labour intensive than the old walk behind trolley method.

[hemmjo]

I am not positive, but it appears the guide line is actually a string, or small diameter cord. Possibly stretched between permanent pins placed at each end. The "box" appears to be a "sifter" so the hammer blows shake the chalk dust out. The men are setting it down very carefully, perhaps to avoid shaking out unwanted dust to make a phantom line. I can see where doing it this way might be slow, but also make the line quickly and easily to repaired if it gets "erased" during a game.