Abstract: An explosive composition is provided which includes a hydrocarbyl polyamine emulsifier, characterised by a straight link between the hydrocarbyl group and said polyamine. A method of forming the composition is also provided, characterised by the emulsifier being produced by reacting an alkanolamine with a hydrocarbyl halide.

Abstract: A simple, low cost, light weight biscuit jointer (21) comprises an elongated motor housing (23), a motor end cap assembly (25) fixed to one end of housing (23) and a base assembly (27) for engagement with a workpiece. To form a biscuit receiving slot in a workpiece, the motor housing (23) and end cap assembly (25) are pivoted relative to base assembly (27) for sweeping a an elongated, generally cylindrical bit (29) through an opening (31) in a base plate (33). The sweeping action is effected by an operator rotating a handle (35) fixed to end cap assembly (25) counterclockwise (FIG. 2) relative to base assembly (27). A handle (37) is used to stabilize base assembly (27) as house assembly (23) is pivoted to form the slot.

Abstract: A laterally movable hand held motor driven cutting tool adapted to cut grooves of predetermined depth in wood, has a cutting bit with a hollow tubular cutting end. A plurality of peripheral chisel shaped cutting edges are formed in the tubular end. The cutting edges are spaced by semi-elliptical knife-like portions of the tubular end. A depth adjusting ring and guide are provided to control the depth of the grooves.

Abstract: A mortising machine comprising a clamping means whereby the machine may be mounted upon a workpiece; a drive motor mounted such that its drive shaft is substantially perpendicular to the working face of the workpiece; a cutting head mounted to the end of the drive shaft adjacent the workface; and a support means to support the drive shaft between the drive motor and the cutting head. The support means also provides support for the drive motor, the drive shaft and the drive motor being slidably mounted to the support means to be movable perpendicular to the workface. There are feeding means between the support means and the motor such that the drive shaft can be fed through the support means; and a guide is mounted to the clamping means to which the support means is slidably mounted such that the support means together with the drive shaft are capable of movement on the guide perpendicular to that produced by the feed means.