A gypsum composition for denture investment consists of 100 parts by weight of a mixture of 50-90 parts by weight of alpha -Gypsum hemihydrate ( alpha -CaSO4.1/2H2O) with 10-50 parts by weight of beta -Gypsum hemihydrate ( beta -CaSO4.1/2H2O) and 0.2-2.0 parts by weight of a soluble potassium salt. As the soluble potassium salt, use may be made of one or more of potassium sulfate, potassium chlor...

A programmable controller which operates in accordance with instructions of a stored program is capable of prohibiting outputs to selected controlled external apparatuses at any step in a control sequence. Following removal of the output prohibition, the control sequence is subsequently executed from the state present when the output was prohibited. The controller safely stops the sequential opera...

Apparatus for the oxidative removal of coke from a coke contaminated solid fluidizable catalyst such as a fluid catalytic cracking catalyst comprises a high temperature coke combustion zone (1), a catalyst disengagement zone (2) and an external heat removal zone (3). A mixture of coke contaminated catalyst, oxygen-containing regeneration gas and hot regenerated catalyst and cool regenerated cataly...

A diffusion cover for a motor vehicle headlamp comprising upper and lower mutually inclined translucent cover portions are integrally joined together to define therebetween a ridge on an outer surface of the cover and a trough on an inner surface of the cover. In order to obviate or mitigate glare, the trough is disposed above the ridge, the inner surface of the upper cover portion in the region o...

A composition comprising Portland cement and a hydrated alkali metal silicate powder is of utility in stabilising soil. Such a composition can be mixed with spoil removed from, say, a road trench, replaced and compressed to give a surface which is soon suitable for re-use. A composition may additionally comprise additives such as plaster of Paris, a thickener, a silicofluoride and/or a dust suppre...

The invention relates to a process for manufacturing contoured inserts for chocolate boxes by thermoforming a thermoplastic film. In the process a reference plane is used as a basis, which determines the position of the edge of the contoured insert. In order to achieve the object of providing the contoured inserts with the appearance of a classical cap package and to keep the individual cups forme...

PURPOSE:To process instructions in a high speed, by providing a circuit detecting the duplicated operands when the distance of the head addresses of two operands is a prescribed value or below. CONSTITUTION:A subtraction circuit 10 subtracts an address signal 51 from an address signal 50, and feeds a signal 56 to a subtraction circuit 11. Further, the subtraction circuit 11 subtracts the signal 54...

PURPOSE:To use stack regions before and after extension on a main storage as one stack region at all times, by setting the extended stack region to a write permitted section together with the stack region before extension. CONSTITUTION:A lower limit address of the extension region is stored in a register RB1 of a control register section 103B at first at the stack extension. Further, an upper limi...

PURPOSE:To bring automatically an extended stack region to a write permitted section, by using commonly a register storing the lower and the upper limit addresses of the stack with a register representing the write permitted section out of stack control registers. CONSTITUTION:Stack overflow is produced and a stack instruction error is generated at the use of a resident stack region STACK-A. An ex...

Plastics sections 1,2 of thermoplastic material are welded together by contact heating of the surfaces to be joined and then pressing these surfaces together whilst using metal elements which are pressed flat onto adjacent outer surfaces of the sections and which have opposed edges spaced apart by a narrow gap and shaped at 11,12 to produce a shaped weld reinforcement having opposite rising surfac...

A liquid crystal display and a method of fabricating the same are disclosed, comprising two substantially plane parallel transparent substrates or carriers, two polarizer foils applied to the outer faces or sides of the substrates and a liquid crystal material enclosed between the substrates. The liquid crystal display is encapsulated with a layer formed of poly-para-xylylene, 2-chloro-poly-para-x...

An instrument for the measurement of the positions and positional changes of joints and of the spine (arthrospinometer) in which a dip circle in combination with a compass and an angular degree division related both to the circle and to the compass are arranged in a common housing, the angular degree division being rotatable relative to the housing, the housing being rotatably hinged between the a...

The invention describes chemical agents for preventing efflorescences on cement products. These agents are aqueous phosphate salt solutions of monovalent, divalent or trivalent metals. The saturation, relative to the first stage of dissociation of the phosphoric acid, is preferably 0.5:1.0 to 1.0:1.0. To prevent efflorescences, the said solutions are applied in the usual manner to the cement surfa...

PURPOSE:To perform the reproduction with high quality even after a special reproduction is repeated, by obtaining a deviation to a fixed position of an optical system from the information signal given from a photodetecting element which is produced in the special reproduction mode and then compensating the cumulative errors of a tracking control means produced in the special reproduction mode in r...

PURPOSE:To improve the reliability of error correction, by securing an error correction even in case an error arises to an error correction routine. CONSTITUTION:When the first error is detected, the first error correction routine 211 is indicated for correction of the error. If the routine 211 contains an error, the second error correction routine 212 is indicated. Then an error display means 25 ...

The lamp has a light source (3) for at least approximately colourless light and two filters (7, 5) which are arranged behind one another between the light source (3) and the outside of the lamp. The filters (7, 5) are each coloured in a non-saturated colour which is complementary to a standard colour for the lamp by means of additive synthesis. Provided between the filter (7) next to the light sou...

An improved hermetically sealed semiconductor casing 10 and a process for producing the casing are disclosed. This casing includes a lead frame 14 having an electrical device 12 affixed thereto, A base member 20 is glass bonded to a matching surface of the lead frame. A metal window frame shaped device 26 is provided having one surface 28 with a refractory oxide coating and a second opposite readi...

Novel antibiotics of the following structure wherein R represents a moiety selected from the group consisting of hydrogen, -COCH2NH2, -COCH2NHCONH2 and -COCH2NHCHO; process for preparation thereof; and biologically pure culture for use therein.

Aminoglycosidic antibiotic comprising a 6-0-(3''-aminoglycosyl)-2-deoxystreptamine optionally having a 4-0-(aminogycosyl) group, such as kanamycins, gentamicins, sisomicin, forms reversible complex with zinc cations by association of the zinc cations with some pairs of aminohydroxyl groups in the aminoglycoside, and the zinc-complexed amino groups are blocked from acylation. Reaction of this zinc ...