When the spray started flying, dodgers were rigged over the hatches to prevent water from being driven under them. The dodgers were secured to a grooved wooden breakwater that extended across the forward side of the hatch and down both sides by any one of three attachments. Alternatively, you could use an aluminium extrusion that accepted a luff rope sewn to the dodger.
With the arrival of mass-produced boats, the double-opening hatch almost disappeared. The vast majority of cruising boats now have only single-opening hatches and no dodgers over them. In hot climates, if it starts raining in port, the hatches must be closed, and the boat becomes a sweatbox. At sea it becomes a sauna, as the hatches must be shut to keep spray from getting below. Modern, low-profile dorade ventilators, which we’ll discuss momentarily, do not gather enough air and thus worsen this condition.