Manuscripts/Mixed Material [Oil Finders]
Dr. [?] has examined an ordinary [?] fitted with a specially designed indicator of the rate of [?] which [?] sensitive to [??] from oil. The interesting thing about this invention is that it is claimed that it can be employed in medical diagnosis in the determination of [?]. This device responds in daylight, but cannot be used at night; nor is it reliable on a rainy, cloudy day.
Of another device, Dr. [?] reported: “The [?] versatile radiation-sensitive device consisted of a black rubber rod about 6 inches long on which [??] a ball bearing. A [?] rod carrying an adjustable weight on one end and a removable [?] [??] inches long and one-fourth inch in diameter at the other and [?] fastened to the ball bearing and at right [?] to the rubber handle.
“When the handle [?] held in a vertical position the brass rod could rotate in a horizontal plane. The radiations from the oil were said to come from the ground in [?] paths [?]