This is where the "Irons magic" happens. Lip slurs are exercises where you change pitch without tonguing (using only air speed and embouchure tension).
The book is currently published by Carl Fischer Music (Product # O138). The retail price is usually between $9.99 and $14.99. For the amount of information contained, it is arguably the best value in trumpet literature. earl d irons trumpet pdf
Before the PDF, before the widespread distribution of his book, there was the man. Earl D. Irons (1892–1967) was a titan of American brass pedagogy. Based in Texas, Irons served as the Director of Bands and Brass at the University of Texas at Austin. His influence on the "Texas band style"—known for its precision, tonal purity, and technical facility—cannot be overstated. This is where the "Irons magic" happens