Flat Earth

We have been authoritatively assured that the curvatureof water can be proved by three poles, and a notable incidentis referred to on the Bedford Canal, Cambridgeshire.“If three poles of exactly the same height be placed in a line, themiddle one always appears higher than the other two outer …

In calculating the amount of curvature, or dip below theeye-line of the observer, we have a simple rule, ignoring somesmall decimal points, namely:— Square the number of milesgiven as the distance, and multiply the product by eightinches, and divide by twelve, which will give in feet the depthof …

Perspective: True and False Some of the Laws of Perspective are given in the firstpart of this book, so that we need not here enlarge uponthem ; but as they are very important, we briefly recapitulatethem.(1). All parallel lines, like those of a railway, seem toapproach, and finally to meet in the …