Maunsell initiated trials with Urie N15 No. 442 in 1924, and proved that better performance could be obtained by altering the steam circuit, valve travel and draughting arrangements.
The results indicated that better performance could be obtained by altering the steam circuit, valve travel and draughting arrangements, although the first two recommendations were deemed too costly for immediate implementation by the Locomotive Committee.
This was based on Italian locomotive practice and allowed precise control of steam admission to the cylinders while improving exhaust flow and boiler draughting characteristics when compared to the more conventional Walschaerts and Stephenson valve gear.
It's all draught and craft".
"This whole book is but a draught — nay, but the draught of a draught.
Recommended libation: iced draught Munich lager.
Aortic valve replacement.
Fancy making a dachshund draught excluder?
Draught animals, fertiliser and skills were in short supply.
