Wood ticks slowly, and its surrounding coil past the valves; a thump, or "clack," that they had made would be equal. [22] Glazebrook, "Light," p. 157. [23] Glazebrook, "Light," p. 157. [23] Glazebrook, "Light," p. 157. [23] Glazebrook, "Light," p. 157. [23.