678 KEPOKT — 1882. 



travelled, and the speed during any given space of time before the brakes are 

 put on, 



2nd. The time that has been occupied in bringing the locomotive and the car- 

 riages to rest after the brakes are put on ; and 



3rd. The number of revolutions that have been made by the engine, and there- 

 fore the distance travelled during this time. 



These are all the necessary elements for recording the efficiency in ' stopping 

 power ' of any railway brake. The weight of the locomotive and of the carriages 

 attached to it being known, the speed at which they are travelling when the brakes 

 are put on ; the time which it takes to bring them to rest ; and the distance over 

 which they travel after the brakes are put on, can all be obtained from the diagram. 



5. On a comhinecl Gas Motor and Cold Air Machine. 



By J. J. COLMAN. 



The author described a combination of the refrigerating machine invented by 

 himself with a gas engine of the Otto type, the object being to enable the machine 

 to be used when steam power was not available. 



6. Collapsihle Boats. By B. L. Berthon. 

 The author described the system invented by himself of collapsible boats, and 

 recommended its adoption in sea-going vessels. 



7. The Pressure of Wheat stored in Elongated Cells or Bins. 

 By Isaac Roberts, F.G.8. 



The author gave an account of certain experiments carried out by him with 

 the view of ascertaining the pressure on the bottom of the tall bins in which corn 

 is frequently stored. The result of these experiments showed that, after the corn 

 had reached a certain height in the bin, the weight of any further additions was 

 taken by the sides of the bin and caused no increased pressure on the bottom. 



