"Mutton Quad"? (Post#2)

To be honest, when I first read the brief, although I'm aware that the task is about typography, I didn't actually knew what "Mutton Quad" really means. So I've searched the internet to look for its definition.

As I made my research, I've learned about two units of measurement used in Typography. These are Em and En. Em defines the proportion of the letter's width and height in regards to the point size of the currently used font while En is just basically half the width of it. This means that, if 1 em in a 16 point typeface is 16 points, the en is 8 point.

As I continue with my research, I was able to find the meaning of "mutton quad". It is basically another term for “em-quad” which is a metal spacer used in printing presses. It is being called “em-quad” because it is composed of a square one em on each side. This allowed the insertion of an em space (  ) character between other typographical characters, in old-fashioned printing presses. Now, because 'em quad' is hard to distinguish from an 'en quad', printers sometimes referred to it as "mutton quad". 

        

In metal type , the em was the height of the metal body from which the letter rises.

(Measurement c in this illustration)

- http://en.wikipedia.org/wiki/Em_(typography)