300 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



on its second side with a door of wood fireproofed by this process, 

 and on the thii-d with a window of protected glass, that is, glass 

 cast on metallic gauze. Wood piled up in this enclosure was set 

 on fire and extinguished after the interior temperature had reached 

 about 1400 degrees. The wooden fireproofed door was consumed 

 only after the lapse of one hour. But the iron door was very quickly 

 put out of shape, and allowed such a quantity of heat to pass that 

 ordinaiy boxes placed at a distance of three metres (about 10 ft.) 

 were consumed. 



Wood thus i-endered incombustible is imputrescible, its tenacity 

 is greater, but it can be readily worked. It can be glued perfectly, 

 and can be painted or varnished to prevent the penetration of 

 moisture and to avoid the decomposition of the ammoniacal salts. 



This new method of rendering wood incombustible, while 

 materially augmenting its value, does not involve a large expense. 

 Experience, indeed, has shown that the cost of fireproofing by this 

 process is less than that of other methods in use, and that the wood 

 can be employed for numerous purposes, especially on war vessels, 

 where metal has been hitherto used. 



