A method for protecting stationary constructions, located in water and surrounded by water, against strain caused by a moving ice field in said water. A protective structure is arranged around said stationary construction. Said protective structure has a cross-section considerably greater than the cross-section of said stationary construction and it comprises, at the water surface level and below this level, an outer surface which slopes downwards in a direction against the stationary constructi...

A protection mask is provided comprising a flexible hood having a head opening for placing said hood over the head of a wearer, said hood being made of transparent plastic for allowing the wearer to see through the walls thereof, means for gathering the head opening of said hood around the neck of the wearer, said hood having an inhale opening in the walls thereof located in the vicinity of the mouth of the wearer, filtering means covering said inhale opening for filtering air entering through s...

Histidine derivatives of formula I are useful inter alia in peptide synthesis. ##STR1## wherein: X represents --CH.sub.2 OCH.sub.2 Ar, in which Ar is a phenyl substituent optionally substituted by one or more halogen, alkoxy, alkyl or nitro groups; Y, which differs from X, represents hydrogen, a protective group capable of inhibiting self coupling during formation of a peptide bond, an amino acid residue, a peptide chain or an antibiotic residue; E represents OH,OM,M representing an alkali metal...

An overload protection circuit for an electrical signal source is disclosed in which an overcurrent in the signal source is sensed and the source is disabled for a predetermined time interval. If the overcurrent condition persists beyond the predetermined time interval, the turn-off cycle is repeated. The system is immune to overcurrent transients and the amplitude of the current which triggers turn-off, as well as the length of the predetermined time interval, may be selectively set.

A particular overload protection is provided for a circuit which is normally closed by an electromagnetic circuit breaker energized by a relatively low level holding current. The overload protection is particularly provided through an auxiliary electromagnetic system connected to be responsive to the current in the circuit governed by the circuit breaker whereby the auxiliary electromagnetic system includes an armature carrying a plunger penetrating the circuit breaker such that upon occurence o...

An electric motor protection device comprising a body, an electric strip, a plunger, and pressure and temperature sensitive snap discs. The electric strip moves from a current conductive, closed position to a current nonconductive, open position when the current conducted through the strip exceeds a preset level. The plunger engages the electric strip also to move the strip from the closed position to the open position. The pressure and temperature discs move from normal positions to overcenter ...

A bi-directionally effective overload protection device for a rotation machine part includes two coaxially arranged, mutually juxtaposed ring discs frictionally connected to a machine; a gear disc with outer gearing and inwardly directed flange means circumscribes the ring discs; a plurality of springs hold said gear disc normally in particular position in relation to the ring discs, permitting the gear disc to rotate relative to the ring discs upon occurrence of an overload in either directiona...

A protection cover for a wiring distribution box in which rising walls are continuously or discontinuously formed around a label bonding position.

The protection layer (3,4,5) applied to a support (1) by a vacuum plasma spraying process comprises an adherence layer (3), an intermediate layer (4) and a coating layer (5). In order to enable a universal application of the protection, particularly in the construction of turbines, foundry and nuclear technique, the adherence layer (3) is made of a selected material having a composition and a thermal expansion coefficient close to those of the material of the object to be coated (1). The interme...

An audio and/or video system for transferring information stored on a disc, tape or film which prevents unauthorized or unintentional use or disclosure to third parties of the information contained on the disc, tape of film. The disc, tape or film is contained within a cassette having structure for sensing intrusion into the cassette. The sensing structure triggers an abrasive or cutting device which destroys the information on the disc, tape or film when intrusion into the cassette is sensed.