Abstract: There is described a snorkel mast for a submersible vehicle. The mast terminates at the upper end in an inverted U-shaped snorkel head pipe section closed by a butterfly valve. The butterfly valve is operated by a bell-crank lever having a float at one end and a water impact flap at the other. Operation of the bell-crank lever by water level action against the float or by water impact action on the flap if a wave washes over the top of the snorkel mast acts to close the butterfly valve. The mast carries a fairing which comprises a number of fairing elements of airfoil cross-section, vertically spaced on the mast so as to be freely rotatable thereon in water lubricated bearings. The segmented fairings on the snorkel mast maintains hydrodynamic stability during high speed turns.

Abstract: An improved desk structure comprising multiple interlocking panels. The structure includes a pair of parallel vertical end panels interconnected by a pair of parallel transverse vertical panels by dovetail tongue and groove joints. First and second horizontal transverse panels are secured between the vertical end panels by tongue and groove joints and extend respectively outwardly from one of the vertical transverse panels. A pair of spaced parallel vertical intermediate panels extend upwardly from one of the horizontal transverse panels and are connected to one of the vertical transverse panels by tongue and groove joints. A rigid horizontal top panel is supported by the upper edges of the end panels, the transverse vertical panels and the spaced parallel intermediate panels. The top panel is preferably formed of rigid transparent material.