Having posted something serious now I can go the the arkane friveous question. I noticed in a new book some pictures of the delivery of the K-36's to Salida in the mid 1920's without visors on headlights and remembered that I had seem a number of pictures from about that period of K-28's with the same features. So who decided that they looked better with visors one the headlights and when was this monumental change done. I have a hard time seeing that the visor really helps the concentration and thus improves the lighting.
Twist this around the lamp post.
Frank