This is a mid 19th century chartometer or map measure made by “The Morris Patents Engineering Works, Birmingham” in mid 1800's with a low serial number (10026). The instrument measures and register distances on maps, plans, scaled drawings and can be used also for different scale maps. The way how it works is guiding the small steel wheel along any route on a map, the hand registers the distance in miles, yards , according to the dial in use and the scale of the map, which should correspond. To change the map scale the glass front is opened by pressing a spring; the dial is removed, and another corresponding to the fresh scale is slide into its place. Al the original charts which are present in excellent condition : Scale 1/2500, or 25.344 inches to a mile, Scale, 6 inches to a mile, Scale 1/500, or 10.56 feet to a mile, Scale, 1 mile to an inch, Scales, 2 and 4 miles to an inch, Scales, 3 and 6 miles to an inch and Scales, 5 and 10 miles to an inch. The device is made of nickel covered brass and has a 45 mm diameter face and comes in wonderful morocco leather and purple silk and velvet case. Dimensions : 3 1/2 inches x 2 1/2 inches x 7/8 inches . Condition of the instrument almost mint !
