Boston, Mass., March 7, 1902.

As all foundry-men know, the making of a successful core requires a lot of time and patience. I speak now of crooked cores which require venting in every direction. A way is herewith suggested which ensures a perfect vent in every core, and takes far less time than the method often used.

While the core is being "rammed up" a small wax wire is laid in; it makes absolutely no difference how crookedly it is put in, so long as it is all inside the core, with the ends only projecting. The core is then put in the oven and baked, after which process it is ready for the mold. In baking, the wax wire has melted and disappeared, leaving nothing in its place but a free and open venthole. It is even better for straight venting than an iron wire, because the walls of the hole are, of course, lined with the wax, and no particles of sand can fall in to plug the vent, let alone the risk of breaking the whole core by pushing, or trying to push, an iron wire through it.

This process is not theoretical; it has been tried and proved very successful.