A sail plan is a drawing of a sailing craft, viewed from the side, depicting its sails, the spars that carry them and some of the rigging that supports the rig. By extension, "sail plan" describes the
"Sailing carriage", 1785
Full-rigged clipper ship, Comet, 1851
A brig is a type of sailing vessel defined by its rig: two masts which are both square-rigged. Brigs originated in the second half of the 18th century and were a common type of smaller merchant vessel
Sail plan
…Ocean-going merchant vessels Brig with two square-rigged masts Brigantine with square-rigged foremast and fore-and aft mizzen…
The South Shields collier brig Mary, painted by John Scott in 1855, showing two views of the same vessel. A Bentinck boom is fitted to the foot of the fore-course as a labour saving device when tacking.
A small trading brig entering the Bristol Avon, painted by Joseph Walter
Rimac, a brig built by Brocklebank in Whitehaven in 1834 for trade between Peru and Liverpool