adiabatic lapse rate to calculate the lower altitude at which these ice crystals begin forming as follows str3 such an altitude places the ice crystal formation well within the radio coverage area of the east marion experimental station although the formation is over the ocean 4 now the vertical height of the ice crystal formation under study equals one hundred times the wavelength of the operating frequency times 0 6111 5 the ice crystal formation is therefore the equivalent of one hundred 100 space lattice passive repeaters vertically stacked one upon another remembering my earlier computations we see that the d distance between the plates had been initially determined as follows str4 further we saw that 2d had to equal the multiple m of 0 476 of the wavelength u03bb or 16 50 feet 1d 0 238 therefore the final vertical separation between the plates to complete the space lattice passive repeater must be determined as follows 1d is equal to 8 25 feet plus 4 71 feet is equal to 12 96 feet 12 96 feet divided by 8 25 feet is equal to 1 57 or pi divided by 2 returning to the formula derived from bragg 39 s law we see that 1 57 360 u00b0 16 50 34 7 in summary the spacings between the plates of this particular space lattice passive repeater are as follows str5 6 now an objection could be made that the thin stacked metallic plates of the space lattice passive repeater although they correspond to the planes of the crystal lattice structures employed by bragg do not correspond to the thin flat primitive microscopic hexagonal.