
66 LIGHT AND HEAVY VEHICLE TECHNOLOGY
which process abstracts energy from the vibrating crank-
shaft and dissipates it in the form of heat from the
damper.
Historically, it was once again Dr F.W. Lanchester
who first proposed the idea of a viscous damper to
control crankshaft torsional vibrations, and it was the
subject of a patent by him as long ago as 1910. However,
it was the further research by the Americans G.J.
Dashefsky and Capt H.M. Jensen at the New York
Naval Shipyard in 1930 that produced the first really
practicable viscous damper as we would recognize one
today. Rather interestingly these early researchers used
furniture glue a