Standard Alphabets for Highway Signs (1966)
The pattern
This still is filed under Direct-from-the-founder letter.
Define
A letter in one person's voice, written as if to one reader, signed by the person who owns the outcome.
Mechanism
Personal authority. The signature is the proof. The tone is the brand. A committee cannot write this and keep the mechanism.
Verdict
Trust sits on a person
Why it works
The grid is the entire delivery mechanism. Rather than publish dimensions and hope a shop reads a table correctly, the 1966 edition prints the letters at exact two-inch size on a ruled ground, which converts every reproduction method - photographic, shadowgraph, hand transfer - into the same proportional scaling operation. The specification therefore travels without tolerance drift. Splitting the manual into drawn shapes and numeric spacing tables also separates the two jobs cleanly: the plate answers what the letter looks like, the table answers what goes between letters, and neither is asked to carry the other. The cover set as an actual sign panel is the proof device up front - the reader sees the output before reading a word about the method.
Steal this when
Use this when a standard has to be executed identically by many hands you will never meet and cannot train. Ship the artifact at true size against a measuring ground instead of a dimension sheet, and keep the judgment calls (spacing, fit) in a lookup table that returns one number.