Popiilttr Science Monthly 



841 



A Singeing Comb Which Prevents 

 Hair Conflagrations 



SUiVlli barbers do not difl'L'riMi- 

 tiiite between singeing 

 your hair and Ijurning it. 

 To eliminate all ])Ossil)le 

 danger Uavid 1*. C'cra, 

 of Iron Belt, Wiscon- 

 sin, has devised a 

 hair-singeing comb 

 which holds the hair 

 in such a position 

 that only the project- 

 ing ends are affected. 

 The teeth of the 

 guard-comb stand off 

 or are spaced from the 

 teeth of the singeing- 

 comb, so that only the 

 ends that project 

 through the guard- 

 comb are singed. 



A Machine for Cleaning Ceilings 



in Large Buildings 

 MON GOTT- 



illillKllllllllilliliill 



pumi), the cleansing thiid is forced through a 

 tube out of the spray to the ceiling surface. 

 A brush is then rotated or other- 

 wise mo\ed 1)\' gear and lever. 

 The used Huid is caught 

 n the drip-pan and con- 

 \oyecI by the central 

 tube to the secondarA- 

 compartment of the 

 tank. Both tank 

 r()mi)artnients are 

 i-mi)tic-d by cocks. 

 A small motor might 

 c o n c e i V a b 1 y 

 be used to actu- 

 ate the brush, 

 and the labor 

 of cleaning 

 ceilings in 

 large buildings 

 could thus be 

 minimized. 



Ulllllllliri,n,„„in,„„^ 



The barber can't 

 bum your hair if 

 he uses this 

 simple guard comb 



Utilizing the 

 Welsbach 



S' 



LIEB of New 

 York must know 

 something of the 

 neck-craning diffi- 

 culties of cleaning a 

 ceiling. We judge so 

 because he has in- 

 vented a portable 

 contrivance com- 

 prising a tank on 

 wheels with a super- 

 structure consisting 

 of a movable or ro- 

 tatable brush on an 

 adjustable arm; a 

 spray, also on an 

 adjustable frame; 

 and a centrally 

 placed drip- pan to 

 catch all spray and 

 drops of cleansing 

 fluid falling back 

 from the spray fun- 

 nel or ceiling. 



The tank is suli- 

 divided to contain 

 both the cleansing 

 fluid (in the shade(l 

 section) and the 

 dirty water conve\-- 

 edfromthedrip-pan. 



W'hen air-pressure 

 is applied through a 



I 



Water is forced against the ceiling surface and 

 a rotating brush moved by a gear and lever cleans it 



Waste from 

 Mantles 

 X making Wels- 

 li a c h mantles 

 nuist of the raw ma- 

 icrial is wasted. 

 About dity per cent, 

 ot that is cerium. 

 You light your cigar 

 with that cerium, 

 (irobably. (^ombined 

 with alcohol, it pro- 

 duces alcohol-ignit- 

 ing sparks when 

 scratched. If a 

 Welsbach has brains 

 enough to device a 

 mantle, depend up- 

 on it he has brains 

 enough to devise a 

 si)ark-producing al- 

 loy out of the waste 

 left in the manufac- 

 turing process of the 

 mantle. 



I f \- o u wonder 

 v.li.ii makes the 

 llame of certain elec- 

 tric arcs so white, at- 

 tribute it to cerium. 

 The waste of the 

 Welsbach mantle in- 

 dustry actually 

 serves to stimulate a 

 ri\al of the Wels- 

 bach mantle itself. 



