An optical microscope slide in a charged particle instrument such as an electron microscope or a focused ion beam instrument. Furthermore, when a three-dimensional model is created from a captured pair of images, each client sends the pair images to the server, and the server creates a three-dimensional model on the basis of camera information stored in advance and the received pair images. The flow of information between the server and the client is provided through a secure communication. The convection chambers contain a tube-in-tube device filled with catalyst in the annuli.