838 THE COLLIERY GUARDIAN. May 5, 1916. HARDY “SIMPLEX Type B5. Extra light, for ripping & brushing HARDY “SIMPLEX” Type B7. Heavy, for sinking. HARDY “SIMPLEX” Type B6. Medium, for drifting, etc. ■ ■ These machines are in use to the number of many thousands all OYer the world. They have utterly defeated all competition, and stand supreme as examples of fast-boring rock drills of immense durability and superb engineering finish. TRIALS ARRANGED. THE HARDY PATENT PICK CO. LD.