Abstract: The present invention is directed to a process for producing a sintered lithium disilicate glass ceramic dental restoration out of a porous 3-dim article, the process comprising the step of sintering the porous 3-dim article having the shape of a dental restoration with an outer and inner surface to obtain a sintered lithium disilicate ceramic dental restoration, the sintered lithium disilicate glass ceramic dental restoration comprising—Si oxide calculated as SiO2 from 55 to 80 wt.-%, —Li oxide calculated as Li2O from 7 to 16 wt.-%, —Al oxide calculated as Al2O3 from 1 to 5 wt.-%, and—P oxide calculated as P2O5 from 1 to 5 wt.-%, wt.-% with respect to the weight of the dental restoration, the sintering being done under reduced atmospheric pressure conditions, the reduced atmospheric pressure conditions being applied at a temperature above 600° C.

Abstract: A motion-picture camera has a diaphragm whose aperture size is inversely proportional to the frequency fed to the diaphragm control servo-motor. This frequency is normally maintained between a predetermined upper limit and a predetermined lower limit. For fade out the frequency is rapidly decreased to the lower limit and thereafter regularly increased to the upper limit whereas for fade in the frequency is rapidly increased to the upper limit and thereafter regularly decreased to the lower limit. During rewind the frequency is maintained between the limits. This frequency increase and decrease can be effected by connecting oscillators of different frequency to the motor in a stepwise fashion, or by varying an impedance element of the tuned circuit of the oscillator that operates the diaphragm motor. Resistors and/or conductors strips on a control or program wheel can be used to carry out the fade out and fade in.