TIN REFLECTORS. 189 



A. Bright tin reflects (or throws back} 

 1he heat, which issues from the fire in 

 rays; and (by reflecting the heat upon 

 the meat) assists greatly in roasting it. 



Q. Why would not the tin REFLECTOR do as 

 well if it were PAINTED ? 



A. If the tin reflector were painted, 

 it would be utterly spoiled, because it 

 would then absorb heat, and not reflect it 

 at all. A plate-warmer should be kept 

 very clean, bright, and free from all 

 scratches. 



Q. Why should a REFLECTOR be kept so very 

 CLEAN and free from SCRATCHES? 



A. If a reflector be spotted, dull, or 

 scratched, it will absorb heat, instead of 

 reflecting it ; and, therefore, would be of 

 no use whatsoever as a reflector. 



Q. Why does HOAR-FROST remain on TOMB- 

 STONES, long after it has melted from the QR^SS 

 and GRAVEL- WALKS of a church-yard ? 



A. Tomb-stones being white, will not 

 absorb heat, like the darker grass and 

 gravel; and, therefore, the white tomb- 

 stones (being so much colder) retain the 

 hoar-frost after it has melted from other 

 things. * 



