Patent GB-448494-A (GB)
Title: Improvements in or relating to apparatus for investigating the the properties of di-pole substances
IPC: G01N22/00
Filed: 1934-08-31
Abstract: Apparatus for investigating and determining the characteristic frequency range of dipole substances, i.e. the frequency which an influencing electromagnetic wave must possess in order to cause the dipole substance to become doubly refractive comprises a tube resonator system adapted to be connected to an ultra-short wave generator and consisting of coaxially arranged tubes and of reflecting bridges displaceable relatively to one another within the tubes, a space for the reception of the substance to be exampled being located between the reflecting bridges and this space being limited by light permeable discs which permit observation of the substance.  The substance to be examined is contained in a chamber 101 formed by two telescopic tubes 102, 104 and two gold film coated glass plates 100, 105, of which the latter is carried by the tube 104, which can be adjusted to vary the resonance conditions in the tube 102 by a rack-and-pinion device 106, the adjustment being observed on a scale.  Energy is supplied to the outer tube 102 and to a central silver wire 108 which is electrically connected to the plates 100, 105 of the tube oscillator, through carriers 110, 111 which are connected to a valve generator system for ultra-short waves of quasi-optical range, such a device being <PICT:0448494/III/1> described in Specification 448,417.  The variation in the optical activity of the substance with the frequency are studied by a light-beam from a source 114, which after traversing the polarizing Nicol prism 117 and quarter wave plate 118 traverses the liquid in the chamber 101 and then passes through a second quarter wave plate 119 and an analyser 120 to an eye piece 123. In order to avoid loss of light by the gold-films on the plates 100, 105, these may be replaced by plane parallel plates and the tube 102 is connected to an outer tube 9 having an adjustable reflection bridge a , movement of which by a rack-and-pinion varies the resonance conditions, the wire 108 being continued by the part 108<1>.  Wave carriers may be dispensed with, energy being supplied through a feeder system 154 of concentric tubes which is connected to the main tube 102.  Instead of the light-beam traversing the length of the tube 102 it may be directed transversely across the tube, which is then provided with two pairs of windows spaced along its length and with two adjustable reflection bridges such as the bridge a , between which the liquid is confined.  The entire optical system may be traversed along the length of the tube so that variations of the effect depending on the field distribution &c. may be observed. An electrostatic field may be superimposed on the alternating electromagnetic field if desired.  A reservoir 112 may be provided to receive excess liquid when the plate 105 is adusted or inlet and outlet openings for the chamber 101 may be provided through which liquid may flow continuously, the temperature being thermostatically controlled.  Specifications 417,501 and 417,564, [both in Group III], also are referred to. According to the Specification as open to inspection under Sect. 91, the apparatus may be used for supplying the characteristic frequency range to the substance when prolonged treatment is desired.  This subject-matter does not appear in the Specification as accepted.