Dividers are constructed in a similar manner to compasses but their function is generally one of measurement rather than drawing. They were also used in conjunction with Gunter scales and sectors for calculation.
Brass dividers. The upper plain dividers with a simple 'long joint' at the head date from c1800. The lower ones are hair dividers by William Elliott, dating from between 1835 and 1849; they have a 'sector' head joint. The point on the lower leg continues, as a flat spring, in a recess, almost to the head and is attached at that end by a small screw. The screw in the centre of the leg moves the point in and out to a small extent to give fine adjustment. Hair dividers should not be confused with compasses which they superficially resemble.
Electrum instruments from an early twentieth century W F Stanley set. The form of the hair dividers has several improvements over the Elliott one above. The adjusting screw for the point has been moved much closer to the end and the attachment to the leg is about half way up, making it possible to produce a more open and larger recess for the users fingers. Divider spring bows are now provided for small measurements and these have Stanley's 'Type B' removable needle points.
A nineteenth century divider spring bow with turned and knurled brass handle.
An Italian pocket divider and sheath dating from the nineteenth century.
Flat pattern hair dividers and divider spring bows by Charvos, USA. Both have detachable needle points. The handle on the hair dividers is self centring and the adjusting wheel on the spring bows is in the centre, both quality features. The set dates from the second half of the twentieth century.
A small, steel divider of unknown origin and date.
A Threadwell, electrum, folding pocket divider, circa 1986.
A steel spacing divider, late twentieth century.
Electrum triangular dividers, signed Heath & Co., London SE9 in a morocco covered, blue silk and velvet lined, snap case. Dates from the first half of the 20th century, post 1912, and possibly after the 1926 takeover by W F Stanley. These instruments are very rare and were used for transferring the positions of three points from one drawing or plan to another.