More questions about television lighting

[Rinehart]

I have a paper by William Eddy that he delivered to the spring meeting of the Society of Motion Picture Engineers in 1939 on the development of television lighting from 1935 to 1939. In it he makes a few statements I don't understand, and I would like to hear if someone could explain them to me.
First, he says they started by using the same lights and arrangement of lights as were used in the movies, and notes some of the limitations: "In the Radio City studio we installed routine spots and broads. Due to the limitation of a ninteen foot ceiling, a practical light bridge was out of the question." What does he mean by "light bridge"?
Second, he says, "...it was immediately apparent that the excessive glare and operational requirements of such a battery of lights precluded their general use in television." What does he mean exactly by "operational requirements"?
Third, he notes that during the initial phase of experimentation they concentrated on producing adequate floodlighting, "lacking the characteristic modeling that might prove embarrassing in certain sequences." Huh?
I've extracted the relevant pages, and if anyone would like to post more of them just ask me.