Abstract: A solar collector comprises a solar absorbing tube comprising enclosure enclosing an absorbing section, comprising a radiation absorbing plate and a tube, containing a working fluid in thermal contact with the plate. The tube extends out of one end of the tube and connects with a condenser wherein the thermal transfer fluid when in a vapor phase communicates with a fluid to be heated within an end fitting. The condenser of a tube is inserted into a thermal pocket sealingly engaged with a gasket within the pipe receiving portion of the fitting, whereby heat transfer can take place between the condensers of the pipes and a fluid flowing via path in the fitting. The pocket is sealed against ingress of heat exchange fluid flowing through the fitting.

Abstract: A solar collector comprises a solar absorbing tube comprising enclosure enclosing an absorbing section, comprising a radiation absorbing plate and a tube, containing a working fluid in thermal contact with the plate. The tube extends out of one end of the tube and connects with a condenser wherein the thermal transfer fluid when in a vapour phase communicates with a fluid to be heated within an end fitting. The condenser of a tube is inserted into a thermal pocket sealingly engaged with a gasket within the pipe receiving portion of the fitting, whereby heat transfer can take place between the condensers of the pipes and a fluid flowing via path in the fitting. The pocket is sealed against ingress of heat exchange fluid flowing through the fitting.

Abstract: An acoustic destructive aerial target seeker having recognition-guidance cuitry which is adapted to detect and recognize the characteristic sound emitted from an armored vehicle and to launch and direct the system toward destructive impact with the target.