Abstract: The invention relates to a sample collector apparatus (10) for collecting samples of flowable solid materials that comprises a housing (11) and a delivery opening (15) at the upper end of the housing (11) through which material to be sampled is delivered into the housing (11). A deflector (12) is located within the housing (11) and has an upper end (13) located below the delivery opening (15) and has an angled wall (14) that acts to deflect the material. A receptacle means (20) is located towards the lower edge of the deflector (12) for receiving a sample of the material flowing downwardly. The receptacle means (20) has an opening at (17) at its lower end through which the sample passes.

Abstract: The invention is a transmission sleeve for the reverse cirulcation down hole hammer activated by fluid under pressure, the hammer including an outer hammer casing, a drill bit retaining means (17) and a drill bit (10) retaining means (17) and extending forwardly therefrom. The transmission sleeve (25) comprises a transmission sleeve retaining means to retain the transmission sleeve (25) to the hammer, a flange (28) to direct exhaust fluid from the hammer extending from the transmission sleeve retaining means towards the cutting face (14) of the drill bit (10) so that the exhaust fluid is directed towards the cutting face (14) and a chamber (30) that extends circumferentially around the drill bit (10) into which the exhaust fluid flows prior to discharge from the end of the flange (28).