| 摘要 |
<p>In order successively to perform several chemical reactions in the same container (10), for example for assaying uranium in the presence of plutonium and fission products by the Davies and Gray method, this receptacle is placed in a workstation, above which emerge tubes (16, 20) for supplying the products necessary for the reactions. When a product is to be introduced, a computer orders the lowering of the corresponding tube. When there is the risk of the product reacting inopportunely if it falls into the container (10) outside the time provided for this purpose, the lower end of the tube (16) for supplying this product is automatically offset with respect to the container, when this tube is in the raised position, for example by interaction of a finger (102) with a slot (100) forming a cam. <IMAGE></p> |
