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A powder, such as an abrasive powder, is delivered from a pressure vessel having an outlet in the floor communicating with a flow of pressurized gas. A container of the particulate material is located within the pressure vessel and has an outlet to dispense small portions of the particulate material

A powder, such as an abrasive powder, is delivered from a pressure vessel having an outlet in the floor communicating with a flow of pressurized gas. A container of the particulate material is located within the pressure vessel and has an outlet to dispense small portions of the particulate material. The material in the container is at substantially the same pressure as that in the pressure vessel itself.

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1. Apparatus for pneumatically delivering particulate material to a dental tool, the apparatus comprising:(a) a pressure vessel having a hollow interior, a floor and an outlet in the floor communicating with a flow of pressurized gas;(b) a receptacle container containing the particulate material to

1. Apparatus for pneumatically delivering particulate material to a dental tool, the apparatus comprising:(a) a pressure vessel having a hollow interior, a floor and an outlet in the floor communicating with a flow of pressurized gas;(b) a receptacle container containing the particulate material to be delivered, the container being located in the vessel at a distance above the floor and having a container outlet located above the vessel outlet and in communication therewith via the hollow interior of the pressure vessel, the container outlet being dimensioned to supply a small amount of the particulate material to exit therefrom to the vessel outlet;(c) means for supplying pressurised gas into the vessel and for circulating the pressurized gas about the container so that the material in the container is at substantially the same pressure as in the remainder of the vessel; and(d) power means to vibrate the vessel to cause the small amount of particulate material to exit from the container outlet for free fall through the hollow interior of the pressure vessel to the pressure vessel outlet and be pneumatically transported via a pipeline at substantially uniform pressure to the dental tool. 2. Apparatus according to claim 1, wherein the container is removably sealed by a releasable seal to provide a transportable container containing particulate material. 3. Apparatus according to claim 1, wherein the access to the interior of the vessel is via a top cap which has a pressure resistant seal. 4. Apparatus according to claim 3, wherein the cap is engaged with the top of the vessel by a bayonet fitting arrangement. 5. Apparatus according to claim 1, wherein at least a portion of the vessel has translucent or transparent walls. 6. Apparatus according to claim 1, including a pressure receptacle to receive any particulate material in the pipeline left when the supply of gas is switched off. 7. Apparatus according to claim 1, wherein the container is open sided and has a platform below a single exit port which is arranged to that the particulate material will descend from the vessel outlet on to the platform. 8. A container for use in apparatus according to claim 1, the container containing dental particulate material, and having an exit port in the floor above a platform which together define an open sided chamber, the exit port being releasably sealed by a stopper, the top of the container also having a releasable seal. 9. A method of delivering particulate material pneumatically to a dental tool, the method comprising:(a) providing a container containing the particulate material in a pressure vessel having a hollow interior, a floor and an outlet in the floor, the outlet communicating with a flow of pressurised gas leading to the dental tool;(b) locating the container above the vessel outlet and in communication with the vessel outlet via the hollow interior of the pressure vessel, the container having a container outlet located above the vessel outlet and dimensioned to a small amount of the particulate material to the vessel outlet;(c) supplying pressurised gas into the vessel to entrain particulate material from descending from the outlet of the container; and(d) providing and actuating power means to vibrate the vessel to cause particulate material to exit from the outlet of the container for free fall through the hollow interior of the vessel to the outlet of the vessel whereby the material is delivered pneumatically at substantially uniform pressure to the dental tool.