548 SEC. 12. APPLIED MECHANICS. 



2212d. Section of Tabular Results showing the Wear 

 of Steel Bails. F. IV. Webb. 



2212e. Lovelies Patent Apparatus for recording the bad 

 joints on railways and tramways. Thomas Lowell, M.Inst.C.E 



This invention is for the purpose of showing the faulty joints in the per- 

 manent way, thus providing a means, hitherto unprovided for, for showing in 

 the case of broken springs, or the oscillation of a train, on which side the 

 fault rests, whether in weak springs or bad joints, and consists of a clockwork 

 movement, arranged to draw an endless paper over suitable drums, in com- 

 bination with a pencil. The indicator is attached between the spring and 

 footplate of an engine or other vehicle, the pencil making a longitudinal line 

 when no oscillation, and a vertical line when oscillation, takes place. The 

 length of such vertical line is various, according to the amount of such 

 oscillation. 



The instrument exhibited is capable of taking a diagram over 120 miles of 

 line, when attached to an engine travelling 60 miles per hour, without change 

 of rollers, the rate of travel of the paper being 4 inches per minute ; this can 

 be reduced or regulated by adjustable flies for a lesser speed of engine. 



2212k. Pog Signal. Edward Alfred Coivper. 



This simple little instrument illustrates the application of the science of 

 acoustics to a very useful object, namely the communication of information 

 from a person on a railway to the driver of a passing train, in a dense fog or 

 on a dark night ; it is the only instrument that accomplishes the object, and 

 has been the means of saving many thousands of lives. Invented by the 

 exhibitor in 1841. 



The principle consists in producing a very different sound from any that is 

 constantly recurring in a railway train, and a sudden explosion or detonation 

 is found to be the best for the purpose ; it is caused by the explosion of a small 

 quantity of gunpowder in a small tin box, by the firing of a match inside which 

 is crushed by the wheel of the passing train. 



Telegraph Steam Signal. W. H. Bailey. 



2214. Model of London and its Environs. Scale 12 

 inches to a mile. John Fowler, Westminster. 



Made for the purpose of showing before Committees of the Houses of 

 Parliament the railways existing or in course of construction during the year 

 1864; also the proposed system of the inner circle railway, comprising the 

 Metropolitan Railway, the Metropolitan and St. John's Wood Railway, and 

 the Metropolitan District Railway. 



2215. Improved Method of Reversing Rolling- Mills. 



Jeremiah Head, M.Inst.C.E. 



A separate piece is introduced between the clutch and each clutch wheel, 

 and connected with the latter only by elastic arms. The shock which ordi- 

 narily takes place when the clutch is thrown into gear is thus prevented. 



2215a. Photograph of a Coal- testing Station. 



2215b. Description of experiments on Coal relating to steam 

 producing power ; determination of the proper breadth for the 



