Curtain rods pulling anchors out of walls. Need lots of advice.

[pushkins]

Something has to hold the header and every 16" there must be a stud. Jacks are not allowed to stand alone and must be accompanied by a king. I am familiar with masonry anchored windows and regardless of these types of windows a header must be in place, to carry the/any load therefor insuring a jack and king very nearby.

[The Builder]

A masonry structure don't need a wood header. It can be metal just to support the bricks and so on. Alot of new houses are framed out with wood and have a brick or other masonry veneer, but a number of old houses that were made of brick didn't have framing as is the case today. A number of them have interior partitions that are framed, and a number of them even have wood blocks between the bricks at different locations to fasten windows and doors but no framing

[pushkins]

Your correct, up until 1928 there was no code specifically set for header support over windows or doors on " Cavity Brick" building, cavity brick being two layer of brick work usually with plaster over the inner layer to give a finished wall. However, even then wood blocks were placed in the cavity wall to allow attachment of finish material like trim and curtain holding material.
One was placed at either end of the window (same place as jacks/kings were placed) and more than not at least one in the center of the opening.
These were specifically placed to allow attachment of finishing material. Builders back hen ( assuming this home was built back then) worked with the next trade in mind, that is, the mason always had in mind the carpenter and his needs, the carpenter always had in mind the plumber and so on. Unlike today where the framer comes in does his job...then the plumber...then the electrician...etc...etc... and none care about the next trade's job, mainly causethey are not there to hear the complaints , unless the GC is there to ensure some sort of cohesiveness.