Abstract: The invention relates to a process and an apparatus for calcining solids or sludges in a multiple-deck furnace having a firing region, which has at least one upper heated hearth and at least one lower heated hearth, and having a cooling region, which is provided with one or more unheated hearths, material to be calcined passing first into the firing region and then into the cooling region. A portion of the material to be calcined is delivered to the at least one lower heated hearth and/or to the cooling region, bypassing the at least one upper heated hearth of the firing region.

Abstract: The invention relates to a process and an apparatus for calcining solids or sludges in a multiple-deck furnace having a firing region, which has at least one upper heated hearth and at least one lower heated hearth, and having a cooling region, which is provided with one or more unheated hearths, material to be calcined passing first into the firing region and then into the cooling region. A portion of the material to be calcined is delivered to the at least one lower heated hearth and/or to the cooling region, bypassing the at least one upper heated hearth of the firing region.

Abstract: In a method for burning carbonate-containing material the latter moves as a result of gravity in counter-current to the cooling and combustion air through a shaft kiln. The fuel supply takes place by means of burning lances introduced into the granular burning material at right angles to the shaft wall. On limiting the grain size and the residence time as a result of this type of fuel supply it is possible to achieve high burning temperatures even suitable for hard burning without there being any sintering together of the granular burning material.

Abstract: In a method for burning carbonate-containing material the latter moves as a result of gravity in counter-current to the cooling and combustion air through a shaft kiln. The fuel supply takes place by means of burning lances introduced into the granular burning material at right angles to the shaft wall. On limiting the grain size and the residence time as a result of this type of fuel supply it is possible to achieve high burning temperatures even suitable for hard burning without there being any sintering together of the granular burning material.

Abstract: The invention relates to a passive reply device for use, for example, in automatic wireless transmission of multi-place numerical information between it and an active interrogation device which are movable with respect to one another, particularly for track-bound transport apparatus, which comprises a high frequency line section having a high frequency antenna at one end, and short circuited at its opposite end, and a plurality of high frequency coaxial resonators extending transversely to and carried by such line section, with a number of resonators being proportional to the number of places of the information to be transmitted. The resonators consist of individual elements which are inserted in appropriate bores of the line section with a press fit. The tuning of the individual resonators is determined by the particular shape of the bottom wall of each resonator, with the resonators otherwise being similar in construction.

Abstract: A multi-purpose fishing light has a housing provided with an opening covered by a translucent lens. An aperture is formed in the lens for receiving the lens portion of a spot/flood lamp, while a fishing lamp assembly is mounted in the housing for reflecting light through the translucent lens. Control of the lamp is achieved by a regulator assembly including a rheostat and a four-position switch.