This series consists of 2939 individually hand drawn plans showing land held by landowners on the Isle of Man, circa 1840. The plans were originally lodged with the Isle of Man Rolls Office under The Tithe Commutation Act 1839.
The plans were pasted onto paper or linen for binding with each bound volume containing a separate parish. Some parishes do extend over more than one volume. The plans are numbered sequentially within each parish volume.
The plans come in a wide variety of shapes and sizes, from two inch square to over two foot by four foot. Some are highly decorated and coloured, while others are very rudimentary. Any plan larger than the volume had to be folded, sometimes several times and in several directions.