Inter alia , a reagent transport apparatus for use on a clinical analyzer, the said reagent transport apparatus being for supporting a plurality of reagent containers and selectively positioning any one of the reagent containers at a reagent aspiration point, characterised in that it comprises:

a base;
a reagent tray mounted on the base for rotation about a primary vertical axis of rotation;
a drive motor for rotating the reagent tray about the primary vertical axis of rotation;
a control unit in the form of a computer circuit for operating the drive motor selectively to position a selected one of the reagent containers at the reagent aspiration point;
a plurality of mounting assemblies disposed in a first circle on the reagent tray, concentric with the primary vertical axis of rotation;
a plurality of agitating assemblies disposed in a second circle on the reagent tray, concentric with the primary vertical axis of rotation, each of the agitating assemblies having a respective secondary vertical axis of rotation;
and
an agitating motor for rotating each of the plurality of agitating assemblies about the respective secondary vertical axis of rotation;
each agitating assembly comprising:

a first reagent container holder mounted on the reagent tray for rotation about the respective secondary vertical axis of rotation;
a satellite gear in communication with the first reagent container holder, the satellite gear being concentric with the respective secondary vertical axis of rotation;
and

the reagent transport assembly further comprising:

a ring gear, concentric with the primary vertical axis of rotation and coupled to the agitating motor, in driving engagement with each of the satellite gears

wherein rotation of the ring gear by the agitating motor about the primary vertical axis causes each of the satellite gears to rotate about the respective secondary vertical axis is disclosed.