The weathered coal samples were tested by a laser detector computer monitored twin pendulum device to measure the comminution energy of breakage particles. The single particle breakage tests were conducted with the three particle sizes (-16.0 + 13.2 mm, -13.2 + 11.2 mm, -11.2 + 9.5 mm) of two types of weathered coal at five input energy levels. The results showed a small variation of comminution energy of same size particles when broken at one input energy because the coal sample used for the test is anthracite coal. The specific comminution energy increases linearly with the input energy for different sizes of coal particle. The breakage products of the single sizes of coal particles are shown that the fine in the product increases with the specific comminution energy. The size distribution graphs are curved and not straight line. The twin pendulum breakage product results show that the fineness of the products increases with the decreases of the particle sizes. The product size distribution from the breakage of particles can be described as a one parameter (t50) family of curves.