I think rear and sidecar brake, may have been connected to the hand brake.
Years ago someone told me it was a spare carb top and throttle slide though why Harold should want such a thing I have no idea.Not too clear when zoomed in but it looks to have a dark area that might possibly be a site glass. Could it be something to give extra oil like some of the vintage bikes had. The oil tank on my Sunbeam had a tube inside the tank that had a cable operated piston to give the engine an extra shot of oil. If it is an oiler it could be to to give the chain a good dose of oil.
In another picture I've looked at you can make out a brake pedal below the object that the cables go in to. The literature says it has an offside mounted brake pedal to suite Harold's single leg and a passenger operated lever for the sidecar wheel brake.I think rear and sidecar brake, may have been connected to the hand brake.
I have a spare slide and choke on my 52 Trophy ISDT rep its an alloy tube like a carb body with a closed end threaded for a carb top containing the ready assembled choke and slide and attached cables and held across the two carb flange nuts under the flange with the cables taped to the respective operating points -choke lever and throttle in an ISDT time was of essence and the rider had to do all his maintenance himself in double quick time.Years ago someone told me it was a spare carb top and throttle slide though why Harold should want such a thing I have no idea.
Giving in to a wet Easter Bananaman and I spent some time on the picture of Harold Taylors ISDT outfit
http://www.stilltimecollection.co.uk/detail/3738-bike;-hrd;-tpt;-vincent.html
Now we saw the sprocket on the widened front wheel and the brake and gear change on the same side (Didn't the German team protest that Harold with one leg had an advantage because he could mount the sidecar nearer the bike?) We also noticed his crutch laying across the seat and spare wheel, the sidecar speedo( driven from the sidecar wheel?) and a few other interesting items.
But what stumped us was the device on the timing cover tucked in behind the rear exhaust and serviced by what appears to be two bowden cables, what is it?
Dear Tim,Yes I saw that thankyou. As to the article, Its a pity but for reasons I will not disclose I dont do Yahoo groups, perhaps someone more braver than me can paraphrase