564, 



The Massaging Chair. Sit in It and 

 Let Two Rollers Knead Your Spine 



BY means of a chair that has recently 

 been invented by Halbert L. Hoard, 

 of Fort Atkinson, Wis 

 consin, a person suffer- 

 ing from spinal trouble 

 or from any of the nu- 

 merous complaints 

 due to "nerves," 

 is enabled to 

 perform the 

 otherwise dif- 

 ficult task of 

 massaging 

 the back and 

 especially 

 the spinal 

 column 

 without the 

 assistance of 

 a profes- 

 sional. A 

 number of 

 hard rubber rollers are pressed against your 

 back by strong springs attached to the 

 roller carriage. By moving a pair of 

 handles up and down, the rollers are 

 similarly moved up and down, the springs 

 keeping them pressing uniformly against 

 your back. With every stroke, the circula- 

 tion through the blood vessels is increased, 

 and unquestionably, some good is attained. 



Popular Science Monthly 



The massaging rollers, pressed in by strong springs, are 

 moved up and down against the spine by means of the handles 



How One Furnace Can Save a Big Slice 

 of the Country's Coal Bills 



FULLY one fourth of the coal used in 

 heating our country's homes is wasted, 

 simply because the average furnace is not 

 properly designed to burn the 

 highly combustible gases that are 

 contained in the coal. The great- 

 est part of our country's coal 

 supply is what is called bitumi- 

 nous, or soft coal, which contains 

 on an average forty- five per cent 

 of highly combustible gases which 

 in themselves form a large por- 

 tion of the heat value of the coal. 

 Gases are distilled from the coal 

 at low temperatures and must be 

 thoroughly mixed with a sufficient 

 supply of air and raised to the 

 proper temperature before com- 

 plete combustion takes place. In 

 other words, prevent the gases 

 from escaping before complete 



combustion has taken place — that is the 

 solution of the problem. 



This idea has been carried out in a 

 furnace, the boiler and foundation of 

 which differ not at all from those of 

 other furnaces, except that the 

 as the proper air- 

 e area so that the 

 oper amount of air 

 is admitted to burn 

 all of the gases 

 completely. As 

 the air erters 

 under the 

 grate and 

 penetrates 

 upward 

 through the 

 incandes- 

 cent coals or 

 hot bed, it 

 mixes thor- 

 oughly with 

 the gases 

 and all pass 

 through the hot bed of coal between the 

 grate and the lower extremities of an 

 arch. The arch is directly over the hottest 

 part of the fuel bed, hence, the gases are 

 liberated immediately back of the arch 

 at the highest possible temperature and 

 come in contact with the heating surface 

 of the boiler after complete combustion 

 has taken place. Thus all the available 

 heat is expended directly upon the boilers, 

 almost none of it escaping up the chim- 

 ney or out into the room. 



Since all the carbon burns, no soot will 

 collect on the fire tubes. Thus still another 

 saving results from the keeping of the tubes 

 free from this heat-insulating substance. 



chimney 



Wa 



air and coal gas 



Arch-heated gases 

 begin hereto burn 



The grate has the proper air-space area into which suffi- 

 cient air is admitted to burn all gases thoroughly 



