Improvements in or relating to methods of and means for determining the presence of living organisms and/or the sex of living organisms

摘要

462,237. Photo-electric apparatus for making biological tests. CHADFIELD, C. R. A. Aug. 28, 1935, No. 24065. [Class 40 (iii)] [Also in Groups VI and XXXVI] A method of testing a subject, particularly an egg, for determining whether a living organism is present and for determining the sex of a sexed living organism, consists in directing upon the subject a beam of light of wavelengths from the violet end of the spectrum and/or a high - frequency oscillatory electrical field, detecting the electrical effects produced by the subject under the action of the beam and /or field by means of electrodes disposed adjacently to the subject, and indicating the effects produced, e.g. by means of a Linde. mann electrometer. A magnetic field may also be directed upon the subject whereby a stronger electrical effect is produced. In the apparatus shown, the egg to be tested is supported in a cradle 2 mounted on a slide 21, ultra-violet light is produced by a mercury vapour lamp 7, a high-frequency electrical field is produced between electrodes 38, 39 and a magnetic field is produced between electromagnets 8. The electrical effect produced by the egg is detected by electrodes 9, 10, amplified by a triode valve 13 and indicated on a galvanometer 14. A mercury switch 19 and an electromagnet 15, 16 are actuated by the slide 21 as the egg is moved into the beam of light, through electric connections and a cable 23b respectively, to momentarily earth the plates of a condenser 18, the electrode 9, and the grid of the valve 13.