San Francisco : Architect and Engineer, Inc · leaf 259
d County L. B. Penhorwood. Bu bscribed befor-e1943. of San FrancIMy . Calif. JUST HOW BIG ISA SPECK OF DIRT7 Girl workers at Northrop Aircraft,Inc., Hawthorne, California, check theanswer to this question on a compara-tor, a photo-electric machine thatthrows an Image of delicate precisiongages,… … The hairs and lumps on the gageshown in the picture above are bitsof dust and lint that accumulated onthe gage when It was left outside theair conditioned storage room. Foreignparticles such as these are virtuallyeliminated from the gages when inthe storage and repair room now, formore than 90 per…
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