Goudsche Machinefabriek B.v.

Stichting Waterbouwkundig Laboratorium

Adriaan B Mann

Jacobus J Vermeulen

Pipe clamp and a probing device comprising a pipe clamp

A calibrating unit for calibrating a pressure gauge includes a piston (7) which may be loaded by pressurized oil and which may be fastened at its upper end to the pressure gauge. A pressure piece (11) being movable within the piston (7) can be loaded at its upper side by a measuring member (3) of the pressure gauge and can transmit this load at its lower side to a spring system (15,16,17) resting on the housing (6) of the unit. The movement of the pressure piece (11) is determined by a measuring instrument such as a measuring watch (21). The deflection of the pointer of this watch is a calibrating measure for the pressure gauge.

Calibrating unit for calibrating a hydraulic or electric pressure gauge,

A probing device for investigating earth pressures including a drill tube having therein at least one linear displacement meter, including a feeler, inserted in an elastic measuring cylinder sensitive to earth pressure exerted on the drill tube, the feeler interacting with a stop element abutting the elastic measuring cylinder. The probing device includes a thrust cone for sensing soil pressure and a shiftable portion of the casing of the drill tube for sensing holding compression. An additional linear displacement meter and a continuously horizontal stop surface may be utilized for measuring inclination of the device.

Probing device for investigation of the earth

An accurate measuring balance for measuring forces or pressures, comprising a travelling mass for bringing a balance arm to equilibrium, which travelling mass is shaped as a body of revolution which can roll on the upper edge of the balance arm, and is mounted in a frame which is movable by an electric motor in the longitudinal direction of the balance arm. The frame comprises rotatable members contacting, in the equilibrium position of the balance, the body at both sides in the horizontal median plane.

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Delft, Netherlands

Adriaan B Mann