said actuator 87 are straight vertical guides 800 for a guided upward and downward slide of the same shelf 80 relative to the platform of structure 1 on which the containers c are located at corresponding and preset positions the containers c exhibit an inner chamber 88 for containing the solid substances for example in the form of powders or crystals and comprise an inner delivery device the said delivery device comprises a vertical rod 89 passing midway across said chamber 88 and to which a scraper 890 is engaged the free upper end 891 of the rod 89 is suitably shaped to fit into the power takeoff 86 of the unit 8 in correspondence of the lower base of the chamber 88 the said containers c exhibit an outlet section for the substances held therein when provided by the program the carriage 5 transfers the means 8 as far as to result in correspondence of the selected container c fig1 then the means 8 are lowered to determine the coupling of the power takeoff 86 of the unit 8 with the end 891 of rod the 89 located inside the container c fig1 b and the jaws 81 tighten on the neck of container c fig1 c afterwards the unit 8 is transferred by the carriage 5 as far as to result in correspondence of the selected tank 3 fig1 d and the motor 850 is started to determine the exit in a preset amount of the substances held in the container c that is the introduction of such substances into the stand by tank 3 located below the construction details may vary in any equivalent way as far as the shape dimensions.