Abstract: A sight glass assembly is bolted to a mounting flange welded to a barge deck around an opening therein at the top of a cargo tank in the barge. A couple of wiper assemblies are mounted to the sight glass and are operable from outside the glass by hand cranks. Each wiper assembly includes a replaceable wiper cartridge having an O-ring as the glass wiping member. The sight glass assembly can be unbolted from the mounting flange for ready access to the replaceable cartridges.

Abstract: A spill valve assembly is mounted to a flanged opening atop a liquid cargo tank of a barge. A valve disk normally closing an aperture in the assembly is maintained closed by a combination of pivoting lever arms. A self-centering post assembly atop the valve disk is held down by a valve retaining lever arm pivotally mounted on a horizontal axis horizontally spaced from the post assembly. When the pressure in the tank rises to the limit established by the valve setting, it moves the valve retaining lever arm sufficiently to tip a control lever arm connected to it and which moves in a way which facilitates further and more rapid pivoting of the retaining arm to thereby permit the spill valve to open freely and relieve the pressure in the tank. Balance weight adjustment means are provided to facilitate adjustment of spill setpoint pressures. A convenient field test of setpoint is provided.

Abstract: On a liquid cargo tank of a barge, a pressure responsive pilot valve operates through a combination of levers to unlatch a main valve clamp arm. One lever is a latch arm having a first position engaging and retaining a latch stud mounted on the clamp arm, and having a second position free of the latch stud whereby the clamp arm is released. A latch hook normally retains the latch arm in the first position but is operable to a second position to free the latch arm from the restraint of the hook. A pilot-operated trigger arm is operable on the latch hook to move the latch hook from the latch arm retaining position to the latch release position. The trigger arm also is able to directly engage the latch arm for unlatching it if not already unlatched immediately upon freedom from restraint of the hook. The main valve seal disk is held closed under a spring-load by the clamp arm.

Abstract: A twist drill is provided with a countersink and collar assembly. The countersink includes a body with a face which cooperates with a similar face of the collar to trap a pair of balls between them. The faces being conical, enable the balls to be driven radially inward into the drill flutes by tightening the collar onto the countersink. A chip deflector is provided at the cutting edges of the countersink.

Abstract: A dial indicator gage is mounted to a bar of sufficient length to measure across a part of a certain size. The bar has holes spaced along it for adjustably positioning an anvil carrier at a distance from the indicator plunger which is sufficient to measure a part of the size involved. A handle-operated plunger retractor retracts the indicator plunger into a cavity when the gage assembly is lifted to move it onto a part or off a part to thereby avoid possible damage to the plunger.