ON THE MECHANICAL EQUIVALENT OE HEAT. 
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The lliermometer Chambers. 
15. A glass chamber for the oiitliow thermometer was iirtvoLliiced as shown (fig. G), 
and another for the inlet, somewhat similar. These were arranged so that the bulbs 
of the thermometers were down in the full current while the scale was in the glass 
tube, through which a portion of the water was allowed to flow, that from the inlet 
thermometer being conducted anay to waste, while that from the outlet was con¬ 
ducted back again into the outflow pipe. In this way, not only the bulbs of tlie 
thermometers, but the entire thermometers were immersed in the flowing water. 
The Ttvo-way Switch. 
16. A switch, as shown in Plate 5, was also constmeted for diverting suddenly 
the stream of elHuent water from waste to the tank, or vice versa, without exposing 
the stream for more than an inch, and without any splashing or uncertainty. 
Experience in Mahimj Observations. 
17. When these arrangements were completed, and whilst the other appliances 
were progressing, Mr. Moorby commenced a series of experiments similar to those 
which had been previously made, using the water from the tank at the temperature 
of the town’s water, and raising it to temperatures which were successively increased. 
This was with a view of testing the improved facilities, and also of gaining experience 
and facility in making and recording the observations. 
VOL. CXC.—A. 2 T 
