Abstract: A Mexican Train Dominoes game includes a game board that defines a central recess corresponding to the train station hub of the game. The recess includes a platform on which an “engine” domino tile is placed to commence the game. The platform can be depressed to activate a sound generation component that is operable to produce simulated train sounds. The game board can include a circuit board that carries a resiliently depressible switch that is operably coupled to the platform. The switch can support the platform in its normal position and can restore the platform to that normal position after the “engine” domino and platform have been depressed during game play.

Abstract: As a result of a special form of the surface coating of Al.sub.2 O.sub.3 catalysts using additional amounts of aluminum ions and very slight amounts of platinum ions, Al.sub.2 O.sub.3 was able to be used as catalyst for continuous operation (150 days and longer) in the preparation of hydrogen cyanide from hydrocarbons and ammonia, preferably in the BMA method.

Abstract: There is obtained an increase in the throughput in the known BMA furnace or a BMA furnace chamber without changing the construction and dimensions already present by changing the lower part of the cooling head into a short tubular heat exchanger while maintaining the necessary temperature profile for the process by arranging the ceramic tubes in the furnace chamber in closer or less close fashion and/or by using ceramic tubes having different inner and outer geometries and/or structure.

Abstract: The previously carried out internal coating of contact tubes not only required very much manual labor and was very time consuming, but it was also unsatisfactory in regard to adhesion of the contact liquid to the surface and homogenity of the catalyst. By the simultaneous action of heat on the liquid interface in the tubes during the lowering of the liquid level as well as by a specially suited apparatus for this purpose which operates according to the principle of communicating tubes there is provided the possibility of a good adhesion to the surface as well as the formation of a homogeneous layer at very little operating expense.

Abstract: The previously carried out internal coating of contact tubes not only required very much manual labor and was very time consuming, but it was also unsatisfactory in regard to adhesion of the contact liquid to the surface and homogenity of the catalyst. By the simultaneous action of heat on the liquid interface in the tubes during the lowering of the liquid level as well as by a specially suited apparatus for this purpose which operates according to the principle of communicating tubes there is provided the possibility of a good adhesion to the surface as well as the formation of a homogeneous layer at very little operating expense.

Abstract: In order to be independent of the situation in regard to methane and natural gas and at the same time to obtain a heating gas there is employed in the hydrocyanic acid-methane-ammonia process (the BMA process) in place of methane an alkanol or alkanediol having 2-4 carbon atoms, preferably ethyl alcohol, and this is reacted with ammonia in a C:N ratio of 0.8:1 to 2:1. Optionally additional hydrogen can be present.

Abstract: Hydrogen cyanide in hydrogen cyanide containing gas is transformed into ammonia by a special iridium catalyst in the presence of at least the equivalent amount of hydrogen for the change. The ammonia is analyzed to provide a measure of the hydrogen cyanide in the hydrogen cyanide containing gas.

Abstract: By introducing the reaction gas mixture of hydrocarbons and ammonia at increased velocity through an inlet tube with one or more openings in a customary reaction tube in the hydrocyanic acid-methane-ammonia (BMA) process the yield of HCN is increased considerably.

Abstract: For the reduction of the ammonia content in the product gas of the hydrocyanic acid-methane-ammonia (BMA) process and accordingly to increase the yield the reaction gas mixture of this process is brought into contact with zeolite and the ammonia thereafter desorbed from the zeolite preferably again employed in the reaction step. If the desorption is carried out with a flushing gas such as the hydrocarbon used in the reaction then this mixture can be directly supplied again to the BMA reactor. Through this procedure the amount of ammonia previously lost to the process can again be made useful in the process itself.

Abstract: The known hydrocyanic acid-methane-ammonia (BMA) process for the production of hydrogen cyanide can now be carried out with liquified gases namely through the presence of additional hydrogen at the beginning of the reaction. The atomic ratio of carbon to nitrogen and hydrogen is from 1:1:7.1 to 1:1.33:13. As additional hydrogen there is the portion of hydrogen present coming out of the reaction "hydrocarbon+NH.sub.3 ". Otherwise the reaction conditions are the same as in the known BMA process.

Abstract: Hydrogen cyanide in hydrogen cyanide containing gas is transformed into ammonia by a special iridium catalyst in the presence of at least the equivalent amount of hydrogen for the change.

Abstract: A closed circuit refrigeration system having an elongated liquid refrigerant conduit in the high pressure circuit portion which delivers a vapor-free stream of liquid refrigerant to the expansion valve separating the high and low pressure portions of the closed circuit. Vapor formed by exposure of the liquid refrigerant conduit to ambient conditions is withdrawn by a dual suction compressor, and the refrigerant approaching the expansion valve is adiabatically cooled to liquefy any additional vapor formed by the withdrawal of vaporized refrigerant from the high pressure portion of the circuit.