What is a stained glass window made of?
What is the structure of a lead came?
Method for modelling the lead cames?
The section of the came is variable. In particular it changes according to:
- technical problems (round cames are good for round lines, because they bend accordingly to the shape without wrinkling, while flat lines are used for straight lines, wideheart cames are used for plated glass, etc etc);
- restoration needs (releading is a common restoration method);
So, which lead section shall I chose for my model? To answer this question is important to decide what is the aim of the project itself. It could be to create a model of an existing window in order to keep knowledge of its actual conservation state, and then visualise an hypothetical model of how the window should have look like when it was built. In this case, at least two different kinds of cames would be needed: the actual cames (generally introduced during a releading in previous restorations) and the original (or supposed to be original) ones. In my opinion, since only small Middle Ages windows are nowadays visible in their original appearance, due to corrosion and multiple releadings, this special period could be the most interesting to visualise.
Middle Ages versus Actual lead cames
The other dimensions (thickness of the leaf, of the hearth, depth of the heart) were stated because, so far, no other references were found on the subject. In particular, thickness of the leaf was stated to 1 mm for everything. Hearth thickness was stated to 1.2 mm when used for nowadays cames and decreased to 1 mm when used for the Middle Ages cames. The depth of the hearth was maintained at 6 mm for every section, in order to allocate glass panes that, in Middle Ages, could have been up to 5 mm thick, according to . However, if visualising plated glass (i.e. two glass panes coupled in the same slot), at least 12 mm will be necessary.