CAtALOGUE. — PHILOSOPHY AND ARTS, PRACTICAL MECHANICS. 201 



Tlieory of Wheel Carnages. 



On the benefit of high wheels. Ph. tr. lG85. 



XV. 856. 



Lahire on the magnitude of wlieels. A. P. 



IX. 116. 

 Parent on the friction upon axles. A. P. 



1712.96. 



Reaumur on the axles of wheels. A. P. 1724. 



300. 

 Couplet on the draught of carriages. A. P. 



1733. 49. H. 82: 



Dupin de Chenoncenu on fourwheeled car- 

 riages. A. P. 1753. H. 301. 



Emerson's mech. 194. 

 The axis is conical, that it may not wear loose ; and it 



must be a little inclined in order to avoid its working against 



the linch pin. 



Beparcleux. A. P. I76O. 263. H. 151. 



Boulard and jSlargueron on broad wheels. 

 Eoz. XIX, 424. 



Jacob on the draught of wheel carriages. 4. 



Anstice on wheel carriages. 8. 



Rizzetti Riforma d^' carri di quattro ruote, 8. 

 Trevigi, 1785. 'R. S. 



Edgeworth's experiments on wheel carriages. 

 Ir. tr 1788. II. 73. Repert. I. 101. 



Lamber on four wheeled carriages. Hind. 

 Arch. II. 51. 



The axes of the wheels should be as their diameters, the 

 rcntre of gravity should divide the distance in the ratio of 

 the cubes of the diameters. A good proportion for the 

 wheels is 4 to i, the centre of gravity being twice as near 

 the hind as the fore wheels. This is nbl ¥ery remote from 

 the usual practice. 



Grobert sur les voitures a deux roues. 1797. 



Enc. Br. Art. Mechanics. 



A. Young, annals of agr. XVIII. 



Strongly in favour of carts. 



Fuss Versufch einer theorie des widerstandes 

 zwey-und-vier-r'adiger fuhrWerke. Copenb . 

 1798.- 



Extr. Ph.M. Xm. 115. 

 On muddy roads, four wheels have the advantage, if they 

 VOL. II. 



run in the same ruts. On harder roads, whether smooth 

 or rough, if not very steep, two wheels have the advantage, 

 and sometimes on soft roads, where there is much lateral 

 friction on the flat surfaces of the wheels. 



Anderson's institutes of physics. Mech. xvii. 

 quoted by Cavallo. N. Phil. 



A horse can draw 25 cwt. on a level road in a cart weigh- 

 ing 10 cwt. with wheels 8 feet high. In a common cart 1 

 horses easily draw 30 cwt. In a common waggon 6 horses 

 draw 80 cwt. : in 3 carts they might draw QO, in 6, 150 

 cwt. : and 3 carts cost less than a waggon. 



Gumming on the effect of conical wheel*. 

 Board Agr. II. 351. Repert. XIII. 256. 

 Would have the axis straight and the wheels cyUndricat« 

 but somewhat dished. 



Montucia and Lalande. III. 732. 

 Imison's elements. I. 129. 

 Ferguson's lectures by Brewster. 3 v. 1 805, 



With many useful additions, yet not without mistakes. 



The great advantage of broad wheels is in deep road*, 

 where the resistance is derived from the depth of immer* 

 sion. 



Particular kinds of Carriages. 



Sailing carriages. Wilkins's mathematical 



magic. 

 Gusset's cart for moving great weights, hi nurd 



Fr. ]Mach. A. I. 99- 

 Thomas's cart with a windlass. Mach. A. II. 



39. 

 Beza'« ehrnr on castors. Mach. A. II. 173. 



Girard's machine for moving a chair. Mach. 



A. II. 187. 

 Descainns's coach suspended in the middle. 



A. P. 1713. H. 76. 

 Descamus's improvements in coaches; A. P^ 



1717. H. 83. Mach. A. III. 65. 109. 

 Godefroy'sinversable chair. Mach. A. III. 97. 

 Lelarge's jointed car. A. P. 1719- H. 81. 



Mach. A. III. 197. 

 Tanney de Gourney's inversable coach. A. P. 



1719- H. 82. Mach. A. III. 207. 

 Reaumur's carriage^ for narrow streets. A.P. 



1721. 224. 



Dd 



