Abstract: An automated wall frame assembly system for use in assembling a wall frame includes an advancer assembly including a conveyor system configured to transport first frame members along an assembly axis to an output of the conveyor system. A frame unit is disposed generally at the output of the conveyor system and is configured to receive the first frame members from the conveyor system and attach a second frame member to the first frame members. A gantry assembly is disposed above the advancer assembly. The gantry assembly includes a gantry frame and at least one gantry tool movably attached to the gantry frame. The gantry tool is operable to deliver the second frame member to the advancer assembly from a location above the advancer assembly for being attached to the first frame members.

Abstract: A catamaran having two spaced apart elongated hulls joined by front and rear cross members holding the hulls in alignment, and having a trampoline extending between the cross members. Cables or wires are carried within enclosures forming side loops in the trampoline and running from the front to the rear of the trampoline between cross members. A plurality of restraining hooks are affixed to the sides of each of the hulls. The cables are detachably held by the hooks to maintain lateral tension in the trampoline.A rudder blade assembly at the rear end of each hull includes a tiller arm connected at its upper end to a tiller crossbar, the connection between the upper ends of the tillers and the ends of the crossbar being live flexible rubber elbows with a snap connect and disconnect between tiller crossbar and the upper ends of the tillers.Pre-formed cylinders are laterally molded into the sides of each of the hulls and positioned to snugly receive the front and rear cross members.

Abstract: A novel acidic etching bath composition is disclosed consisting of an acid e.g. sulphuric acid and an unsaturated alcohol e.g. but-2-ene-1,4,-diol, allyl alcohol, propargyl alcohol or but-2-yne-1,4-diol. Etching plating and enamelling procedures are disclosed for producing enamel coatings with improved adhesion to steel substrates.