I’m reading a book that has a page in the back about the type. I’ve definitely seen this before, but it’s not in every book. The book is a series of interviews with comedians, so I’m not sure who this page is for.
This book was set in Electra, a typeface designed for Linotype by renowned type designer W. A. Dwiggins (1880-1956). Electra is a fluid typeface, avoiding the contrasts of thick and thin strokes that are prevalent in most modern typefaces.
