"To find the value of p which would split the cylinder [of unity length] from end to end... The force tending to rupture such a ring at the sections formed by any diametrical plane is given by formula:F = 2rp,and the area of these sections byS = 2t.The bursting pressure is, therefore, found from the equation:2rp = 2tk; hence p = \frac{tk}{R}...only half as great as... equation { II.}"