72 
Proceedings of the Royal Society 
Monday , 3 d March 1879. 
Professor MACLAGAN, Vice-President, in the Chair. 
The following Communications were read : — 
1. Heating and Ventilating of Churches and other Buildings : 
Report of a Series of Experiments made in a- Hall in 
Upper Grove Place — Dimensions 50 x 25 feet, height 
about 20 feet ; a Stove Chamber being outside at the 
south end, its roof about 8 feet in height ; the only direct 
connection with the Hall being an opening in the mutual 
wall about 7 or 8 feet from the floor, and between 3 and 
4 square feet dimensions. By Charles J. Henderson, 
Edinburgh. Communicated by Professor Jenkin. 
Thermometers were placed throughout the hall, one on each of the 
four walls, 6 feet from the floor, the one on the south wall being a 
couple of feet below the inlet for the hot air. Three were placed 
along the centre of the roof, 2 feet or so under the roof. In the 
stove-chamber, first one and afterwards two stoves were placed, with 
double smoke-pipes before entering the chimney. 
The trials were made for many weeks, and the tables on the two 
following pages give a fair representation of the results obtained in 
the warming of the hall; the effect on the four thermometers, 6 
feet from the floor on all the four walls, being so remarkable as to 
induce my submitting these experiments to the notice of the Royal 
Society. Precisely as the heat, accumulated in the stove-room, 
entered the hall, each of these four thermometers rose in an equal 
degree, as shown in the tables, though the one at the north end 
was 50 feet off. The effect on the three roof thermometers is also 
shown in Table Ro. II. The stove-room had a doorway to outside, 
which during heating was only opened to a small extent. 
It is worthy of notice the amount of heat obtained from the small 
quantity of coals consumed, which it is thought is the result of the 
peculiar construction of the stove smoke-pipes, each having four 
flanges ; and the effect of placing two stoves in the chamber gives a 
very remarkable result as regards the fuel consumed, it being much 
the same as for one ; showing the advantage, where much heat is 
required, of increasing the number and not the size of the stoves. 
