456 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



evaporation, intensified by any passing breeze, brings about 

 a temperature very appreciably lower than that of the sur- 

 rounding air. 1 B, 3Iay 10, 1875, 93. 



METHOD OF PRESERVING EGGS. 



Professor Sacc now announces that by far the best method 

 of preserving eggs for an indefinite length of time consists in 

 coating them with paraffin, of which one pound will answer 

 for fifteen hundred eggs. After being thus treated they do 

 not experience any loss in weight, and will remain unchanged 

 for several months. It is essential, however, that the eggs 

 be perfectly fresh, as, should decomposition have commenced, 

 the operation will not prevent its continuance. 1 -Z?, May 

 16,1875,94. 



PREVENTING THE BURSTING OF WATER-PIPES BY FROST. 



An ingenious method of preventing water-pipes from being 

 burst by frost has lately been patented in England, and con- 

 sists in passing through the pipes an India-rubber tube of 

 such diameter that the cavity inside it is little more than 

 equal to the increase in the volume of water by freezing. 

 The result is that when the water freezes it compresses the 

 rubber tube, and thus, having the space required in expan- 

 sion, all danger of bursting the pipe itself is averted. Of 

 course when the ice melts the rubber expands again. The 

 air is supplied from a reservoir, which is acted upon by the 

 water pressure, so as, automatically, to put the air tube un- 

 der an exactly corresponding degree of tension. By heating 

 the air in the tube the water in the pipes can be thawed. 

 This application is peculiarly useful in the case of water- 

 closets, and in preventing the supply of cold water to engine 

 boilers from being interrupted by frost. 3A,3ay 2, 1874, 

 557. 



WASHING MUSLIN, CAMBRIC, FRENCH LAWN, ETC. 



The articles, after having been well soaked in soft water, 

 are to be rubbed in the direction of the threads (without dis- 

 placing them) with cakes or balls formed from a mass obtained 

 by boiling and skimming one pound of soap, half an ounce of 

 alum, and one ounce of carbonate of potash. After this they 

 are squeezed out, and the operation is repeated several times. 



