|Name and Model Number||Brass Sector|
|Country of Origin||UK|
|Date of Manufacture||~ 1683|
|Front Scales||Unusual sectoral scales, possibly relating to the science of fortification|
|Back Scales||Normal sectoral scales|
|Scale Length||6” on each leg|
|Type of Rule||Other|
|Area of Use||Generic|
|Comment||Apart from the name of Charles ll Rex and the date 1667, there are three other names and dates
shown on the front of this delightful brass sector which also has a third hidden arm to enable
a full triangle to be set up. These are: Tessini with a date of 1630, Prearo Sardi dated 1683
and Count Pagan dated 1650. Two of these three are known to have written books on fortification.
Count Pagan’s book “Les Fortifications de Monsieur le Compte de Pagan” was published in Brussels
in 1668, while Francisco Tensini published his “La Fortificatione Guardia Diffesa …” in Venice in 1624.
Nothing has yet been found relating to Sardi, however this would appear to be the sector which
carried the scales to enable the calculations on fortification science described in these books to be
realised, as well as the more normal sectoral calculations of these times. A really delightful and
extremely rare calculator carrying some extraordinarily early dates.
|Donor||Collection of an English gentleman|
|RR||= Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.|
|RRR||= Very rare -- only very few known to collectors; may take several years before one comes up for sale.|
|RRRR||= Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.|