He considered the 2-foot rule sufficient for Day's Work (although only 3-figure logarithms could then be used).
Umgqaliselo wenyawo ezimbini wayewubona wanele xaku thekelelwa indawo ekuyo inqanawa emini emaqanda nangona oko kwakuthetha ukuba kuyakusetyenziswa ilogerithimu eziswe ilogerthimu eziqu zithathu ku phela.