Heated rear screen - baffled
Posted: Wed Feb 20, 2019 1:40 pm
I needed a heated rear screen for my Plus 2 restoration. I could only find an early (vertical element) screen in need of some work. The elements and the top and bottom horizontal connecting bars appear unbroken, they are bronze in colour and appear to be just under the surface of the glass not surface printed. Above the horizontal connecting bars is a surface printed silvery electrode. The silvery surface layer is in poor condition and needs to be replaced. I can show electrical conductivity along unbroken parts of the silver electrode but cannot demonstrate any conductivity along the bronze heating elements.
I?m sure the bronze elements are not surface printed because in places I can see scratches in the glass across the heating elements but using a high powered lens can see that whilst the glass is scored the element is clearly intact and uncut, also if you run your finger nail over these heating elements you can?t really feel any edges as you might expect if it was surface printed.
So here is where I get confused! If I am correct in saying that the bronze elements are under the surface of the glass, how can this make electrical contact with the surface printed silver electrode and if I?m wrong and the heating elements are surface printed why can?t i measure any resistance along their lengths?
I?m sure the bronze elements are not surface printed because in places I can see scratches in the glass across the heating elements but using a high powered lens can see that whilst the glass is scored the element is clearly intact and uncut, also if you run your finger nail over these heating elements you can?t really feel any edges as you might expect if it was surface printed.
So here is where I get confused! If I am correct in saying that the bronze elements are under the surface of the glass, how can this make electrical contact with the surface printed silver electrode and if I?m wrong and the heating elements are surface printed why can?t i measure any resistance along their lengths?