We will post here any useful files or manuals we come across that will assist those interested in the restoration of Gledhill-Brook Time Recorders. If you have any material you'd like to share, please email it to us and we will post it here on our Resources page.

    Articles and Information

    Suspension Spring Diagram

    Thank you to Tony N, one of our visitors. He created this incredible diagram of a GB suspension spring. We get many questions about the dimensions of these, so hopefully this will help many of you out!

    Punch Cards

    Find below a gallery of images submitted by readers of various GB punch cards.

    Serial Numbers/Year of Issue

    Below is a chart of serial numbers that might be of useful reference to you, as we often receive questions about the age of these clocks. SOURCE: HARRISON P (1991) A Series of Papers on the Early History and Development of Industrial Time Recorders - Paper 1 - Gledhill-Brook Time Recorder Co. Ltd, England, 1912-1964:

    1912 - 3000
    1918 - 13800
    1919 - 17841
    1920 – 18823
    1921 – 19569
    1922 – 21200
    1923 – 21600
    1924 – 21848
    1925 – 22155


    1926 – 22468
    1927 – 22816
    1928 – 23301
    1929 – 23938
    1930 – 29208
    1931 – 50001
    1932 – 50264 

    1933 – 51027
    1934 – 51365
    1935 – 51977
    1936 – 52610
    1937 – 53381
    1938 – 54677
    1939 – 55371
    1940 – 57430


    1941 – 59901
    1942 – 62830
    1943 – 65830
    1944 – 67581
    1945 – 69501
    1946 – 70871
    1947 – 72341
    1948 – 73311

    1949 – 74201
    1950 – 74391
    1951 – 76471
    1952 – 78076
    1953 – 79701
    1954 – 80501
    1955 – 81321
    1956 – 81901

    1957 – 82301
    1958 – 84451
    1959 – 85371
    1960 – 86101
    1961 – 87081
    1962 – 87786
    1963 – 89241