Some may recall the Ontario HP mystery. There are 2 humps of Ishpatine Ridge about 1.25 mile apart, and separated by a deep valley. They have the same closed contour interval, about the same size. The south hump with a lookout tower has been generally regarded as the HP. But the north hump (accessible only by bushwack) is almost the same elevation. I have made several calls to Ontario authorities, and no one could say which was higher. An attempt was made last year to determine the HP with homemade sighting devices, and the result was inconclusive. I am going to give it another shot this summer.
How to determine which point is higher??
I recently tried two methods of sighting from one point to another:
1. I fixed a square tube to a carpenter's level, sighting through the tube like a gunsight, and checked repeatability making several readings. Standard deviation of sightings was slightly less than 1 inch over 200 ft; or 26 inches over 1 mile.
2 This is a variation of the old HP'er trick of sighting across the water line in a water bottle. I took a 6 ft long clear Tygon tube almost filled with water, fixed the two ends and sighted across the miniscus to a second point. Standard deviation of readings was 2.3 inches over 200 ft; or about 60 inches over 1 mile.
These techniques are not acceptable surveying practice I know. Can anyone else give me a better (more accurate) approach? Remember that I will need to canoe and bushwack several miles to reach the hump, so it can't weigh a ton. I will need to climb the north hump (since it is mostly covered with low trees) and sight to the south hump, which is treeless.