22 N. H. Agricultural Experiment Station [Bulletin 303 



A standard size brooder in the process of having the extensions placed on it. 

 An additional curtain was used at the outside edge. 



at the points of highest heat rise. Otherwise, the curve continues to show 

 the same degree and cycle of variation. The range between maximum 

 and minimum extremes is reduced from 45 to about 35 degrees, but in 

 general this plan is rated as having no particular value over the usual 

 floor. 



Extension Rims on Brooders 



The effect on floor temperature of increasing the diameter of the 

 brooder and attaching an additional curtain without increasing the 

 total load of chicks (225-50) is shown by the medium weight line of the 

 upper three curves of Figure 7. 



Neglecting for the moment the first part of the week of this record, 

 it will be seen that the last three days show a brooder floor temperature 

 held to within limits of 10 degrees variation (80-90 degrees F.). The 

 lows and highs of this curve still retain the general cycle or trend that 

 has characterized all readings taken to date, but a large proportion of 

 the low and very erratic temperatures are eliminated, and a noticeable 

 restraining of the high temperature loops is also apparent. In other 

 words, the sought-for leveling out of the floor brooder temperature was 

 largely accomplished by this measure. 



Returning to the record of the first four days of the week, it will 

 be noticed that following an interruption on Monday, this curve repeats 

 the old characteristic of extreme variations, reaching as much as 28 de- 

 grees F, on Tuesday. 



Wednesday it improves, and the differential between extremes re- 

 duces to 16 degrees. Thursday the low dip improves 6 degrees over 

 the preceding day, the top of the curve flattens out still more, and the 

 differential in extreme temperatures closes to about 10 degrees. Fri- 



