Abstract:
The disclosure relates to a system for providing a three-color graphic representation of the subaqueous terrain. As in previous systems, a sound generator is used to transmit an acoustic signal to the ocean floor, which signal is then transmitted by reflection and appropriately received. Received signals are separated into pulses of a plurality of selected frequencies, which pulses are used to selectively activate a plurality of glow lamps in accordance with the detected frequencies. A dichroic mirror system is then used to convert the light from the glow lamps into primary color radiation which is then combined and used to make a photographic record of the signal pattern in color.
Abstract:
Casting a unitized bottle-shaped module having no seams or unsecured junctures is provided by forming a shell-shaped casting void between a conventional, external shell mold and a similarly shaped flexible baglike inner form carried on an elongate support member. A plurality of trammeling tie wires of discrete lengths joins the bag and the support member to limit the degree and manner of extension of the flexible bag as fluids fill its interior. The bag, performed according to the inner dimensions of a bottle-shaped module, provides an inner surface for mold and is equal-distantly spaced from the inside of the outer form. As a casting material, e.g., concrete in poured into the casting void, water and/or pressurized air is passed to the bag''s interior to provide a sufficiently strong retaining wall capable of counteracting the lateral force produced by the casting material before it hardens. After the concrete hardens, removal of the fluid from the interior of the bag allows its collapse, and the support member, tie wires, and bag are withdrawn from the cast module. Thusly, a unitized cast flotation module is provided having no seams, lines of joinder, or similar areas structurally weaker than the remainder of the casting.