CATALOGUE 



OF 



PHILOSOPHICAL INSTRUMENTS, &c. 



MECHANICAL INVENTIONS. 



1. The Peiidulous Printing Press. — By Thomas Edmonson, 

 Milton Station. — This instrument has been invented for the pur- 

 pose of dating the tickets given to passengers on the Newcastle 

 and Carlisle Railway with facility and despatch. Upwards of 

 ten thousand tickets can be printed by it with one supply of ink. 

 This is accomplished by means of a ribbon saturated with a pecu- 

 liar inking composition, attached to two small rollers, ^nd shift- 

 ed by the pressure of the finger against the instrument. The 

 impression, which is dry and permanent, is obtained by simply 

 putting the ticket into a space left ft)r it in the centre of the press. 



2. Model of a Chair and Rail, with Guard, to prevent Car- 

 riages running off Railways, with drawings of a steam boiler, &c. 

 By Ralph Rewcastle. 



3. Intermitting Spring. 

 — By W. L. Wharton, 

 Esq., of Dryburn. — A 

 model to prove that the 

 flowing water, in all in- 

 termitting springs, first 

 forms a valve for the ex- 

 clusion of the atmos- 

 phere, and then a pump 

 for forcing out the air 

 from the syphon. An intermitting fountain is formed by closing 

 the tube T of the cup, (which when filled with water forms the 

 valve at the foot of the syphon.) Upon opening T, the water 

 flows without intermission. 



