E M Jaarsma
E M Jaarsma
Established: (earliest & latest dates found so far: 1894 - 1903)
Location: Netherlands, Amsterdam & Hilversum.
Area of Activity: Safe and patent Safe Manufacturer.
The description below is a Google translation from the original Dutch text:- (ask for a scan of the Dutch text if you can improve the translation)
"Description of the System E M Jaarsma Until recently, the entire safe industry rested on the principle of locking up the values in a poorly heat-conducting cabinet. For this purpose an insulating filling, such as wood ash, slag wool, sawdust with alum, etc. was applied between the inside and outside of the safes. So came the perfection near, of absolute security could never be in this way, if unforeseen a fire lasted long. This is because substances which do not conduct heat conduct do not exist and thus depend on a higher or lower conductivity coefficient of the filling material, for how long a fabric withstands the influence of the fire and keeps the contents in a good condition. Finally, the papers turn yellow, gas develops and the paper slowly becomes charred. These facts were a trace for me to look for the perfection that has not yet been achieved and the result has been surprising. I have come to throw the entire insulating filling of the safes overboard and to use nothing but steaming air and an interchangeable screen. On this principle, the United States of North America, the patent of invention no. 727371 and by Germany the ditto under No. 140009, because it is the first system, which defies infinitely the influence of the fire. However, an American has tried to use running water as a cooling agent, and a resourceful Englishman has devised a steam-developing filling to keep the penetrating heat back, but the system eventually fails against the flames. The supply of water is diverted by the sprayers of the firefighters, and the steam-ejecting capacity of the filling has reached its limit as soon as the stuffing prepared for this purpose has passed. My cooling air flow passes through a channel in the ground to the safe, and is supplied from the inexhaustible atmosphere. Thereby it is a certainty based on natural reasons that the heat penetrates further than a few decimetres into the ground, which is due to the fact that the heat always rises. So I'm putting my channel a bit deeper. I also base my system on the property of the rise of heat. The heat, which absorbs the outer wall of the fire chief in case of fire, radiates to the nines, where I catch the rays, even before they have reached the inside (standing on a pedestal) inner case, in a screen of metal and asbestos. The cold air present along this screen now becomes warm by contact and as a result an air flow is created upwards, in which cold air always passes through the underground channel for the ascending, and the receiving screen is always cooled by contact with that cold air, as diluting the air between the walls of the safe, the tendency to form a vacuum and the supply of cold air always continues. Due to a special device, the rising air can always escape from the top of the cabinet, since the white metal valves immediately melt in case of fire. The fiercer fire, the faster the air flow and the greater the cooling force of the air flow acting on the inner box. For sous-terrain places, one will usually not need my system, but parterre and on floors in large buildings of companies is the first insurance against fire. Information and projects on request free of charge.