132 LECTURE XV. 



LECT. XIV. ADDITIONAL AUTHORITIES. 



Architecture. Perrault's Vitruvius, fol. Par. 1673. Newton's do. 2 vols. fol. 

 1772. Hall's Essay, 4to, 1813. Rickman's Gothic Architecture, 1825. Willis 

 on the Architecture of the Middle Ages, Camb. 1835. Britton's Dictionary of Archi- 

 tecture, 1830-8. Hope's Essay, 2 vols. 1835. Pugin's various works. 



Strongest forms of Columns and Walls. Euler on the Strength of Columns, 

 Hist, et Mem. de Berlin, 1757, p. 252. Acta Petr. ii. I. 121, 146, 163. Belidor, 

 Architecture Hydraulique, ii. I. 420. Coulomb, Mem. des Savans Etrangers, vii. 

 Theorie des Mach. Simples, 1821. Prony sur la Poussee des Terres, 4to, Par. 

 1802. Prony sur les Murs de Revetement, 4to, 1802. 



Practical Architecture. Rondelet, L'Art de Batir, 3 vols. 4to. Par. 1804. Bor- 

 gnis, Traite Elementaire de Construction appliquee & 1'Architecture Civile, 4to, Par. 

 1823. Chambers's Civil Architecture, by Gwilt, 2 vols. 1825. Bullet, Nouvelle 

 Architecture Pratique, par Jay, 2 vols. 1825. Navier sur 1'Application de la Me- 

 canique a 1'Etablissement des Constructions, &c. 1833. Hosking on Architecture 

 and Building, from Encyc. Brit. 4to, 1835. Nicholson's Principles and Practice of 

 Architecture, 3 vols. 1836. 



Carpentry in general. Fuss on the Strains of Framed Carpentry, Acta Petr. 

 1778, ii. I. 194. Encyclopedic Methodique, Arts et Metiers, art. Charpentier. 

 Robison's Mech. Phil. Tredgold's Principles of Carpentry, 1820. Nicholson's 

 Mechanic's Companion, 1824. Carpenter's Guide, 4to, 1828. 



Arches, Domes, and Bridges. Lahire on Arches, &c. Hist, et Mem. de Paris, 

 1702, p. 94, H. 119; 1712, p. 69, H. 74. Couplet on the Thrust of Arches, do. 

 1729, p. 79 ; H. 75 ; 1730, p. 117, H. 107. Labelye on Westminster Bridge, 1739. 

 Euler on the Strength of a Model, Nov. Com. Petr. xx. 271. Belidor, Arch. 

 Hydr. ii. II. 415. Gauthey, Construction des Fonts. Peronnet sur les Fonts de 

 Neuilly, d'Orleans, &c. fol. 1782-8. Berard, Theorie de 1'Equilibre des Voutes, 

 4to, Par. 1810. Wiebekings' Wasserbaukunst, 1812. Ware, Tracts on Vaults and 

 Bridges, 1822. Barres, Nouveau Systeme des Fonts a Grandes Portees, 4to, Paris, 

 1827. Navier, Memoires sur les Fonts Suspendus, 4to, Par. Belidor, Science des 

 Ingenieurs, 4to, Paris, 1830. (Navier's Ed.) 



The student is particularly referred to Robison's Mechanical Philosophy, vol. i. 

 p. 369 to the end, for details on the subjects discussed in this Lecture. 



LECTURE XV. 



ON MACHINERY. 



HAVING taken a general view of those branches of practical mechanics 

 in which forces are to be resisted, we are next to consider the modifications 

 of forces and of motions ; and in the first place, the modes of applying 

 forces, of changing their direction and intensity, and of communicating 

 them to different parts of our machines by the intervention of rods, joints, 

 cranks, wheelwork, ropes, or other flexible substances ; in the second place, 

 the structure of these substances, and the methods by which the union of 

 flexible fibres in general may be effected ; and in the third place, the regu- 

 lation and equalisation of motion, by means of clocks and watches. 



The modes of applying mechanical forces are almost as various as .the 

 machines that are constructed and the purposes for which they are em- 

 ployed : but in general, the strength of men is applied by means of levers 

 or winches, or by walking wheels which slide beneath them as they attempt 



