Unpublished paper, 'Geometrical and analytical deductions concerning the thickness of insulated arches, composed of four parts or wedges' by Marquis Lewis [Luigi] Malaspina di Sannazaro An introductory section of two pages describes the contents of the paper, apparently written originally in Italian, in which the author used French terms of art which translate poorly into English. The paper, including one separate fold-out plate of figures, concerns the geometry that underpins the construction of insulated arches, and is composed of four parts: 1 'Of Semi-circular, or Roman Arches' 2 Of the Acute, or Gothic Arches 3 Of Arches that are of a flatter Nature and formed of portions of circular Arches 4 Annotations to the preceding Problems Includes pencil emendations and marginalia throughout. Subject: Engineering / Mathematics An ink inscription below author line reads 'Mr Cavallo', indicating the paper may have been communicated by Tiberius Cavallo. [early 19th century]