XI. MISCELLANEOUS. 551 



2216F. Twelve Designs of Engineering Works executed 

 by students, Royal College of Science, Ireland. Prof. Pigot. 



2216e. Asbestos Packed Cocks and Valves. 



John Dewrance $ Co. 



This entirely new principle of making cocks and valves with a bearing of 

 asbestos, which is indestructible by heat and most of the acids, instead of the 

 usual metal surfaces, which have to be ground together to make them tight, 

 has stood the test of one twelvemonth's trials with perfect success. 

 Model of 1^ in. cast-iron cock all nickel plated. 

 Drawing-, framed, of 3-in. cock. 

 Model of 3-iu. cock, cast iron, flanged. 

 Do. 2-in. do. do. 



Do. 1^-in. do. do. 



Do. gun-metal shell and two cups. 

 Do. gun-metal 1-in. cock. 

 Do. f-in. water gauge. 

 Do. f-in. do. three-way. 



Do. nickel plated cast-iron plug. 



2216h. Captain MacEvoy's Boat Torpedo, copper, full 

 size. London Ordnance Company. 



A percussion torpedo to be used by a steam launch or other boat. The 

 torpedo is fixed at the end of a long pole which is driven before the boat on 

 torpedo service. When the torpedo comes into contact with the object of 

 attack, it is fired by the concussion through a percussion fuze arrangement. 



This torpedo is also fitted with a separate and distinct apparatus for firing 

 at will from the boat by means of electricity ; charge of powder, 50 Ibs. 



Captain MacEvoy's Floating Torpedo, copper, full size, 

 for harbour defence. London Ordnance Company. 



To be fired by electric wire communication with the shore, or by contact. 

 The torpedo when charged carries 60 Ibs. of powder. 



Captain MacEvoy's Current or Tidal Torpedo, copper, 

 full size. London Ordnance Company. 



The torpedo floats into a harbour amongst the shipping with the tide, and 

 when arrested by any object, the vane is set in motion by the current's flow. 

 In a few seconds the vane releases a hammer which falls by a spring with 

 much force upon a percussion cap. The cap fires a detonating charge which 

 ignites the powder or dynamite or other explosive with which the torpedo is 

 charged. The charge of powder is 50 Ibs. 



Set of Torpedos for Naval use. 



London Ordnance Company. 



" Harvey " torpedo complete with sustaining buoys, towing lines, trigged 

 apparatus for firing, and contact levers. 



The torpedo when charged carries 100 Ibs. of powder. In towing, it 

 diverges several points to port or starboard, and when in contact with the 

 vessel attacked, explodes itself mechanically, or electrically. 



