Trailer Artillery No 29
The No. 29 trailer differs from the No. 7 in being fitted with pneumatic-tyred wheels on drop hubs and is for use with the Mark IIPA carriage.
The ammunition box is as for the No. 7 trailer, constructed of steel plates rivetted together...carries 38 rounds.
Drop hub diagram shown, is to fit the end of the original axle, and lower the wheel centre for the smaller radius steel disk wheels and pneumatic tyres.
Low pressure tyres, 7.50" by 24" are fitted. Note I am not sure if this is the dia of the rim as used in WW2 and later, or the old system of outside dia of the tyre. Remember tyres then had a 100% profile where the width was the same as the height so the tube was effectively circular inside the tyre.
The manual also shows the No. 27 trailer was used for the 18 pdr.
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