Dunno bout no Hebrews but the Greeks used to write like that.

Start writing one way keep going till you run out of line
tuo nur uoy llit yaw rehto eht etirw dna dnuora nrut neht
of space that way and back you go like the first line.

Only they turned the letters around too, so a b in one direction would be a d in the other a p one way a q the other. Now that I think about it I do remember reading the ancient Semites did it too. They settled down on right to left and the Greeks settled down on left to right.