Chapter 5 — CLOUDS AND VISIBILITY 



(corresponding to the angle of projector ro- 

 tation). This angular measurement can readily 

 be converted into height by reference to pre- 

 computed tables. (See figs. 5-9 and 5-10.) 



A RECORDER (RO-121/GMQ-13) which has 

 been developed for use with this equipment is 

 of the facsimile type. (See figs. 5-11 and 5-12.) 



The horizontal motion of the stylus 

 is synchronized with the rotation of the projector, 

 and the density of the record varies directly 

 with the signal strength. 



The recorder uses an electro-sensitive 

 paper roll that comes in a sealed plastic contain- 

 er. To install the paper, remove the plastic 



209.383 

 Figure 5-10. — Cloud height indicator IP-327B/ 

 GMQ-13 showing controls and CRT with cover 

 in place. 



209.384 

 Figure 5-11. — Cloud height recorder RO-121/ 

 GMQ-13. 



covering first then place the roll within the 

 recorder in the following manner: 



1. Unlock the recorder cover with the two 

 cam lock handles on the cover arms and open 

 the cover. (See fig. 5-13.) 



2. Place the roll of paper in the paper 

 supply compartment with the molded paper 



