Mon 28 Nov 1831
From John R Denyer
To John Lane Esq
Considering possibility of getting mud out of Summit Level during a frost. Danger of frost damage to masonry by exposure to weather, and risk of clay lining cracking; uncertainty of stoppage period; expense; probable frozen mud adhere to clay lining; impracticality of working at time of severe frost or deep snow. Suggest Committee consider abandoning idea of doing the work during time of frost. Making arrangements for repairs of most faulty places in Tunnel in event of frost stopping navigation as this only means keeping mortar useable and such work only requires two bricklayers with a labourer.
