to make a meeting show that it was considered vice not only admits air, but it filters and absorbs. The air tool of steel that would compete at least approximately with by the members present as a very the real diamond for this purpose. It has been discovered Lig. eA important and valuable… … other kinds cf apparatus. It appears to us to be one of the most important de- vices yet invented to secure ample and It next passes through a layer of charcoal lumps, perfect ventilation in public school buildings, hospitals, churches, and pri- = Pig. 2 vate dwellings. This invention was patented…
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