An improved circuit arrangement for correcting the measured voltage of an analog speed transducer using a correction voltage derived from the speed proportional pulse train of a digital speed transducer in which the correction voltage is formed in an integrating control whose reference value is a speed proportional pulse train made up of pulses having a constant voltage-time area and whose actual value is the corrected measured voltage. The correction voltage is then added to the voltage output of the analog speed transducer in a summing amplifier to obtain the corrected measured voltage output.

Using repeated cloning and treatment with cis-HPL (200 μg/ml), an analogue of a procollagen precursor inhibitory to the growth of collagen-synthesizing cells of mesenchymal origin, clonally premature epithelial cell lines were isolated from fetal SGH lungs cultured on the 15th day of gestation. One of the cell lines, M3E3/C3, which has been extensively studied for biological characterization, developed poorly differentiated carcinomas in injected hamsters after transformation by MNNG. Moreover, when grown on collagen gel, this cell line indicated an obvious potency for in vitro differentiation in response to vitamin A by developing activated Golgi regions, well developed rER and a number of mucus-like granules. Since such a differentiative responses is expected to be definable in the light of respiratory epithelium developing in utero, this cell line may be useful for studying mechanisms of differentiation-dependent sensitivity of fetal organs to transplacental carcinogen exposure.

This paper deals with the reflective properties of inhomogeneous thin films that in addition may or may not be absorbing. Reflection coefficients have been computed using two different techniques and are plotted as functions of wavelengths. The practical uses of nonabsorbing inhomogeneous thin films include antireflection coatings for broad spectral ranges; absorbing inhomogeneous thin films are useful for making black coatings, rulings, field stops, and sunglasses.