MECHANICS AND USEFUL ARTS. 



65 



with flames from 20 to 25 centimetres high. The bottom of the 

 boiler was placed so as to receive the flame at the height of 14 to 

 16 centimetres above the base. 

 The following table exhibits the results of the experiment : 



The boiler weighed 6.5 kilogs. ; it contained 29.5 kilogs. of 

 water. The number of calorific units produced was therefore 6.5 

 X 9*-f29.5 X 90f ==2,713.5. This corresponds to 3,700 units 

 to the cubic metre of the gas. Van Nost. Mag. 



A NEW ROTARY PUMP. 



This machine works very simply, and, after the manner of cer- 

 tain canals in the animal economy, imitating the vermicular or 

 peristaltic movements of the intestines in their spontaneous mo- 

 tions which aid digestion. Revolving arms, turned by a crank, 

 carry friction rollers, which, in rolling upon an elastic tube, press 

 before them the liquid or gas that it contains, while the tube, 

 regaining its form after the. compression, exerts an aspiration 

 proportioned to the elasticity of its sides. The plan is admirably 

 adapted to all the requirements of stowing or transporting wines. 

 For the use it offers the following advantages : 



1. The wine traverses the pump without shock (batter), an 

 important consideration, and belonging especially to this machine. 

 While in ordinary pumps the wine sustains considerable beating 

 and jolting, in this new apparatus it passes over as in a siphon, 

 and flows," without encountering any obstacle, in an open canal. 



2. The wine undergoes no alteration by its passage through the 

 tube ; long experience having proved that the rubber of which 

 the tube is made cannot injure the most delicate wine. 



3. There is no contact of the liquid with any oxidizable metal- 

 lic surface, nor with greasy crated surfaces, such as, unfortu- 

 nately, occur in all other present s} 7 stems. 



4. This pump yields a greater useful effect, in proportion to the 



* Calorific capacity of the copper. 

 6* 



f Ileat obtained from the gas. 



