18 N. H. Agri. Experiment Station [Bui. 296 



In order to determine the amount and effect of floor drafts, several 

 types of artificial floors were placed under the brooders: — elevated wire 

 mesh, raised floor pad and floor pad with heating elements. Of these, 

 the elevated wire mesh floor showed erratic and great changes of tem- 

 perature. The same characteristics, with some modifications, appeared 

 in the case of the raised floor pad (Vo" off floor) in previous years. 

 The floor pad giving under heat showed the greatest effect in stabilizing 

 temperature, maintaining a 5° to 7° regulation, which is somewhat bet- 

 ter than that gained with the extension rim on the hover. 



Reviewing the comparative value of (1) housing conditions and, (2) 

 brooder design and characteristics as affecting the regulations of tem- 

 perature under the brooder, the past three years' results indicate that, 

 of these two factors, the second is the more important. 



The chicks under the three brooder conditions, namely, heat pad, 

 raised wire floor and brooder extension, averaged to weigh over one 

 pound at six weeks of age — practically the same in all groups. Only 

 '-Lght difi'erences in total feed consumption between groups were noted. 

 In the brooder extension group the average mortality was 3.3 per cent 

 for the six week experimental period. The other groups, brooder plus 

 raised Avire floor and brooder plus floor heat pad, showed 2.07 and 2.03 

 per cent mortality, respectively. 



The average total consumption of electricity required for the groups 

 brooded with the use of floor heat pad was 483 kw. hrs., of which 123 

 kw. hrs. were consumed by the floor pad. Adjustment for the amount 

 of top heat was not made to allow for extra heat provided by floor 

 pad. In the groups with raised wire floor the average consumption 

 was 457 kw. hrs. In the case of the brooder extension groups the av- 

 erage consumption was 361 kw. hrs. The average total kilowatt hours 

 per chick for the three conditions listed was 2.276, 2.149 and 1.703 

 respectively. The work was conducted by W. T. Ackerman, T. B. 

 Charles, G. M. Foulkrod, A. E. Tepper, and R. C. Durgin. {Purneli 

 Fund) 



"V" Belt for Power Grindstone 



As a supplement to the work done in 1934 on "Electric Power for 

 the Grindstone", a "V" belt drive adaptable to the conventional farm 

 grindstone was developed by W. T. Ackerman and G. M. Foulkrod. 

 (Station Circular No. 43). 



A used commercially built giindstone, 2yo"x24" stone on a typical 

 four leg wood frame, designed to be driven by either a hand crank or 

 treadle was secured. 



A small, two bearing, grinder head was purchased for $1.86 and 

 mounted on one end of the frame. The belt pulley in the center of the 

 grindstone head had a 21/^" face, was 2M>" in diameter, and could be 

 driven with either a "V" or flat belt. 



A 48" "V" belt was run to a 10" pressed steel "V" pulley, (cost 

 $1.20), placed on the grindstone axle. 



The motor, a 1/2 h.p.. 1725 r.p.m., was mounted on a wooden frame 

 hung by metal straps so it hinged on a rod through the two legs, about 

 4" from the floor. A "V" pulley 1^^" diameter, (cost $.35) on the 



