Pretty boring photo, I’m afraid. Perhaps that’s forgivable since it’s here for sentimental reasons.The millimetric scale on the right suggests it’s a ruler. However the units on the left won’t be familiar to everyone for this is an em-rule used in an activity that has almost disappeared. Twenty-five years ago, if you wanted to lay out a page design for a magazine or a newspaper you cut up galley-proofs with a pair of scissors and glued them to a large sheet of paper. The stone-hand or clicker at the printer’s used this to create the design for real with cast metal type. Now the designer creates a virtual page on a computer screen and sends the result over the wires in file form.
Printing employs some of the most wilfully obscure units outside pharmacology. Typeface heights come in points and there are a handy 72 of them to the inch. Theoretically column widths could be similarly measured but because this would lead to large figures ems (equivalent to 12 points) are preferred. These archaic units are retained on DTP software and elsewhere on computers because printing is nothing if not conservative.
When computer design became widely available I couldn’t wait to get my hands on it. Now, with a perversity born out of wishes granted, I have sentimental (if not practical) regrets. Print-shops were smelly, dirty, esoteric places filled with ex-apprentice craftsmen who shared a journalist’s desire to put ink on paper. I enjoyed their company. The em-rule is a memorial to that friendship.
