Letter from Denis O'Neill, Ministry of Transport to the Private Secretary to WSC, commenting on invention by Ethelred Chandler [letter CHAR 2/238/111] to give an exterior indication of the speed of a motor car. Commenting that there were two difficulties in making such devices compulsory, firstly that drivers might be tempted to tamper with the device, and that the Courts might not be willing to accept the indication as conclusive evidence of the speed of the vehicle.