Plot points with coordinates where \(x\) and \(y\) are equal. Three points are sufficient, but more can be plotted. Draw a line through the plotted points. If \(x\) is positive, \(y\) is negative. If ...

IN recent correspondence, Mr. P. A. P. Moran 1 has suggested a simple method of finding the surface area of small objects from their average area of projection. Another simple method of finding the ...