1851 Great Exhibition: Official Catalogue: Class X.: Adam Thompson
80. THOMSON, ADAM, 25 New Bond Street — Inventor and Maker.
Autochronograph; for the instantaneous marking or printing of time, giving the month, day, and hour (night and day), with the minutes and portions of minutes.
The machine requires setting but once a month. The clock must be wound once a week. The register may be extended to any required length, and the date, with the exact time, may be stamped or printed in one second of time.
The attendance of guards and of workmen can be correctly noted; and the presence or substitution of particular individuals can be known by their signature upon the register.
The commencement and duration of any event can be correctly registered within a few seconds of time, and all the work of a "time-clerk" correctly done. Provisionally registered.