impossible to dip a glass article even into oil at a high ; ticles such as were sent out to be used; the bottles temperature without chilling it in such a way as to' would stand four times the ordinary wear and tear, and produce varying strains. The cooling surfaces Mr. � the sheets eight to ten times. He arrived at this con Siemens used were, first, a large plate of iron on which I clusion from the circumstance that the breakages of