1951 – A F Moorcroft
1952 – H Bowers
1953 – E Chapman
1954 – W Smothers
1955 to 1956 – S H Smith
1957 – H M Burns
1958 – A G Wilson
1959 – B L Harrison
1960 – R B F Gibson
1961 – A R Grundy
1962 – L H Bradbury
1963 – H G Simms
1964 – P McAlpine
1965 to 1966 – H E G Finlaison
1967 – A G Sherburn