Zerlegbares Modell der Schleifer-Einkammer-Luftdruckbremse
A German technical manual from 1910 by Friedrich, held by the Eisenbibliothek Schlatt, describing a disassemblable model of a single-chamber air brake valve for railway brake equipment. Its three cutaway line drawings show the valve's internal chambers, pistons and passages, numbered for reference, with arrows tracing airflow, useful to a designer wanting schematic mechanical line art.
