William Ford Robinson Stanley 1829 - 1909
Stanley started business in 1854. Among many other patents in 1889 and 1892 Stanley was granted patents for improvements to theodolites and tribrachs.
This theodolite was made with serial number 90159 ( 1890 - Instrument 159 ) and shows the patented dovetailed tribrach system for accurately locating the theodolite above a point.
The theodolite is shown in the advertising pages at the front of a text book printed in 1890 showing details of the patented tribrach system