The drum also contains the photoconductor supply and takeup spools.

鼓还包括光电导体电源和提升卷轴。

The film is spooled for use.

胶卷己装好待用。

It required three spools, each containing approximately 900 feet of number 27 Heavy Formvar wire for the primary sections.

这个工作需要三个线轴，每个上有900英尺27号线来制初级组。

The three wires were fed from the three spools and wound as one wire; thus comprising the trifilar terminology.

三条线从三个线轴出来一条线，从而符合三线并要求。

A spool of slightly less than 100 feet of number 17 Heavy Formvar wire was required for the secondary winding.

一卷大约100英尺17号线足够级组。