62 SEC. 3. MEASUREMENT. 



IV. MEASUREMENT OF VOLUME. 



321. Schmid's New Water Meter. A. Schmid, Zurich. 



This meter consists of two of Schmid's patent hydraulic motors, coupled 

 at right angles, and enclosed in a water-tight casing. They are set in motion 

 by the force of the fluid they have to measure. At each revolution a volume 

 equal to the contents of four cylinders must pass. The pressure required to 

 keep tight the oscillating surfaces of the cylinders is furnished by the 

 difference of pressure at inlet and outlet, which is thus self-regulating. The 

 meter is also kept in motion by the difference of pressure. The frictional 

 resistance is the same with all pressures of the fluid under measure, and, 

 according to the size of the meter, is represented by a water head of 3 to 

 16 ft. The different parts of the meter are constructed of materials not 

 liable to chemical influence. 



The chief advantages of this meter are : 



1. The velocity of the engine is exactly in proportion to the quantity 



flowing through the meter. 



2. According to the most careful experiments, the error, if any, does not 



exceed 1 per cent. 



321a. Siemens' and Adamson's Patent Water Meter. 



Guest and Chrimes, Rotherham. 



This meter has a great resemblance to the motive-power machine known as 

 Barker's Mill. The water passes down through a funnel into the measuring 

 drum, and in passing outward through the curvilinear channels of the same 

 causes it to revolve, delivering a certain quantity of water at each revolution 

 of the drum, and this is indicated by worm wheel and gearing, in gallons, feet, 

 or any other measurement required, on a dial plate properly divided and 

 prepared for the purpose. 



The meter is exhibited in section, so that the internal arrangements and its 

 action can be seen. This meter has been extensively used for upwards of 20 

 years. 



32 lb. Half-inch Patent Water Meter, for the water supply 

 for domestic and trade purposes on the constant supply system. 



J. Tylor and Sons, London. 



322. Measures of Capacity, according to natural principles. 



Hans Baumgartner, Basle. 



323. Measures of Quantity, according to natural principles. 



Hans Baumgartner, Basle. 



324. The Standard Pint, popularly known as The Stirling 

 Jug." The Burgh of Stirling. 



This measure was entrusted to the town by Act of (the Scottish) Parlia- 

 ment, in the year 1437. Sometime previous to 1745 it had been borrowed 

 by a coppersmith for the purpose of making others, and as he joined the 

 insurgents in 45 " it was lost sight of. On his not returning, his effects were 

 sold, all but a few that were thrown into a garret as rubbish ; among these, 

 in 1752, the Stirling Jug was found, after some years of patient and unwearied 

 search (by Rev. A. Bryce, of Kirknewton). It is made of brass, and is in the 



