I. SPECIAL COLLECTIONS. 137 



133. Complete lever parallel train. 



Weighing machine, of Roberval. 



134. Incomplete lever parallel train. 



Weighing machine, of Milward. 



135. Incomplete lever parallel train. 



Weighing machine, of Farcot. 



] 36. Incomplete lever parallel train. 

 Weighing machine, of Schwilgue. 



559. VII. Compound Parallel Trains. 



137. Feathering paddle-wheel, of Buchanan. 



A combination of trains similar to parallel rulers. The floats 

 remain always vertical. 



138. Feathering paddle-wheel, of Oldham. 



The floats rotate about their axes as the wheel revolves. 



139. Feathering paddle-wheel, of Morgan. 



With eccentric ring. 



560. VIII. Higher Couplings. 



140. Uhlhorn's coupling. 



141. Oldham's coupling. 



142. Reuleaux's grooved disc coupling. 



143. Kochlin's cylindric coupling. 



144. Schiirinann's cylindric coupling. 



145. Conic coupling. 



146. Pouyer-Quertier's coupling. 



561. IX. Toothed-wheel Trains. 



147. Spur wheels (point-paths used for profiles). 



148. Returning spur-wheel train. 



149. Returning spur-wheel train, with annular wheel. 



150. Returning spur-wheel train, with annular wheel. 



151. Returning spur-wheel train, with two annular wheels. 



152. Returning spur-wheel train, with two annular wheels. 



153. Returning spur-wheel train, with intermediate wheel. 



154. Returning spur-wheel train, with intermediate wheel. 



Keuleaux's so-called halving spur-wheel train. 



1 55. Returning spur-wheel train. 



With Marlborough wheel. 



156. Spur-wheel train. 



The centroids are Cardan's circles. 



157. Beylich's universal wheels. 



Pin-wheels." 



158. Cylindric friction wheels. 



Held by axial pressure. 



