769312-A is referenced by 2 patents.
769,312. Helical shoots. QUALTER, HALL & CO. (SALES), Ltd. Feb. 15, 1955 [Nov. 16, 1953], No. 31768/53. Class 78 (1). A helical bunkering shoot consists of an upright open helix having a peripheral angle of between 25 degrees, 30 minutes and 28 degrees, 30 minutes to the horizontal and wherein the slope of the track face nearer the axis of the shoot is between 38 degrees and 46 degrees measured in a radial section and with regard to the horizontal. As shown, the shoot is made in sections A having a flange B and being braced by stiffening ribs C, the whole being secured at flange B to a supporting scroll (not shown).