Steam engines, a thorough and practical presentation of modern steam engine practice
A 1920 technical manual on steam engine practice by Llewellyn V. Ludy, issued in Chicago by the American Technical Society for engineers, machinists, and correspondence students. The plates are engraved sectional views of cylinders, valve gear, and governors, hatched to show cut metal and keyed with italic letters and numerals; useful for machine-part silhouettes, cutaway diagram conventions, and labelled callout layouts.
