Popular science monthly . The life-belt consists of a preserver withone or more lamps rigidly fastened in position Where landings are particularK- dan-gerous at night motor-boat parties the luminous life-belt to illuminatethe water and determine the safest placeto dock. The belt is thrown oxerboartlwhen the boat approaches a landing placeand serves admirably as a buoy light. Seeing Yourself as the Oil WellSees You T ^HIS photograph of an oil derrick isabout as unsolvable a puzzle pic-ture as is often seen. Were it not for tiie. Wc leave this to you. Is this photographupside down or
Popular science monthly . The life-belt consists of a preserver withone or more lamps rigidly fastened in position Where landings are particularK- dan-gerous at night motor-boat parties the luminous life-belt to illuminatethe water and determine the safest placeto dock. The belt is thrown oxerboartlwhen the boat approaches a landing placeand serves admirably as a buoy light. Seeing Yourself as the Oil WellSees You T ^HIS photograph of an oil derrick isabout as unsolvable a puzzle pic-ture as is often seen. Were it not for tiie. Wc leave this to you. Is this photographupside down or not? grass and shadow of the lake bank in theforeground it would be impossible to tellwhich was the top and which the bottomof the picture. Or, if the picture ofthe smaller or more distant derrick tothe right is considered alone, one cantell the realit> from the reflection. Thereason for this absolute perfection in re-flection is that the lake is of oil. In the great southern California oilfields, where gushers are being struckwhich flow from ten thousand to sixtythousand barrels of oil a da\, and flowcontinually even, minute of the day ande\ery minute of the night, the onlypossible way to sa\-e the oil is to quicklythrow up an emergency earthen damacross some convenient ravine and turnthe oil flow into the reser\oir formed. A Photographic Eye for the Airman
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
