Set of six cardboard cards modelsof valve and piston motions of high speed steam engines. Produced by Thomas Jomes and T Gilbert Jones. Printed document titled: Working Models of High-speed Steam Engines, Series No. 3 by T. Jones, M. I. Mech. E. and T. Gilbert Jones, M. Sc., Wh. Sc., A. M. Inst. E. E. There is a reduced facsimile of Model No. 6. The 'Willans' Central-Valve Single-Acting Compound Engine, a description on using the models, a List of Models, Special Engineering Publications, Working Models and The 'X' Series of Cardboard Models. Also for full particulars sned to UK.education, tertiary, models for engineering students., working models of high-speed steam engines series no 3, westinghouse, belliss, erith, clayton, willans