COMPRESSED GASES 87 



The first was invented by Mr. E. Beard, and is shown in 

 section in fig. 50. It screws on to the cylinder at D, from which 

 the small orifice is closed at d by the valve /. The gas lifts 

 this valve and enters the bellows A A, which rise with the 

 pressure, but are weighted above to the pressure desired. The 

 top of the bellows has a collar c 1 screwed with a very long 

 pitch, in which the screwed pillar F turns easily as the bellows 

 rises. Below the long-pitch screw F which is merely to turn 

 the pillar easily, is a slow-motion screw f l , the turning of 

 which in its corresponding collar forces the valve down into 

 its seat and stops the supply : thus at a given pressure the 



FIG. 51. Clarkson's Regulator FIG. 52. Beard's Small Regulator 



cylinder is cut entirely off. In practice, while any jet is in 

 use the supply is balanced ; and leaves by the delivery-tube 

 and tap d 2 and d 1 . E E 1 is only an outer casing to protect 

 the internal parts from injury. 



This regulator worked efficiently, but was expensive, 

 (costing about QL), cumbrous, and heavy. Next season a 

 form known as the ' Clarkson ' regulator was brought out, and 

 is shown in fig. 51. The bellows in this case is shaped like a 

 gas-bag, and is made of strong india-rubber framed on steel 

 rods at the edges. The sides are compressed by a strong 

 spring, D, adjusted to the pressure required, and work to and 



