238 Dr Fyfe 07i the Illuminating and Heating Power of 



few degrees above it. A slipper-bath holds in general from 

 25 to 30 gallons. Provided, therefore, the gas can be burned 

 in sufficient quantity, we have an easy method of heating the 

 water. In the trials which I have made, I have used a bath 

 into which were put 24 gallons of water at 50° ; beneath the 

 bath, and at a little distance from it, there was passed a tube 

 of about 2 inches diameter, having six rose-jet burners at- 

 tached to it. The gas was kindled, and in three-quarters of 

 an hour the whole of the water was brought to 100°. The 

 gas consumed was 17 feet, at a cost, therefore of nearly 2d. 



I consider this as a much more easy, and altogether, a far 

 superior method to the heating of baths by burning a small 

 fire placed within the bath ; for in this case, there must be a 

 tube conveyed to a chimney to carry off the smoke, a part 

 of which, in spite of all our attention, often escapes into the 

 apartment ; besides, owing to the great heat immediately over 

 the fire, the water there becomes very warm, and gives off a 

 great deal of steam, which is not the case with the gas, the 

 heat being uniformly applied under the water. I do not mean 

 to recommend this as a method of heating baths for general 

 use ; but where a bath is required, as in a bedroom, I consider 

 it an easy and convenient means of procuring one. All that 

 is necessary is to attach a flexible tube to the pipe in the room, 

 and to take care that it is of such a size, that it will supply 

 gas to the extent of from 30 to 40 feet per hour, according as 

 the bath may be required. Six rose-jet burners with sixteen 

 holes each will be sufficient ; for each of these will burn about 

 8 feet per hour. I believe the rose-jets will be found more 

 convenient than gauze, because the gauze requires to be placed 

 on tubes, which would require the bath to be raised to an in- 

 convenient height. 



I may mention that, instead of the common bath, I had one 

 constructed with a tube passing through the water, and through 

 which the products of combustion passed, but I did not find 

 much advantage from its use. I would, however, recommend 

 that, instead of having a flat bottom, as is usual, the sides of 

 the bath be extended downwards, and made to contain water, 

 so as to prevent loss of heat by radiation, I am aware that 



