Show USE FOR OLD blueprints bleached by a simple process they furnish furn I 1 a h sketch paper of st fair grade I 1 in n the engineering enjO department of every mine office blueprints will acau until the quantity bu has reached amazing proportion some compa nies ales keep a record and file of all print prints made and at periodical times destroy the old ones in addition to this say says the engineering and mining journal Jo urcal at the time of printing there Is to suro our to he be a it certain waste due to poor exposure exposures po sure blotchy paper etc A method for turning this waste into a useful article Is to presented by E B dirken birken bend bond in the american machinist these old or useless prints may ba b bleached by immersing them in a soda bath containing four ounces of soda to one gallon of water it it Is desired to bleach only a portion of the print prink this may be done by painting that part with this solution by washing the prints in fresh water after bleaching any discoloration Is in prevented pre rented the tho blank paper thus obtained furnishes a fair grade of sketch paper and there etre re numerous nume roua other uses ua to which it could also be put pul |