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New Hampshire Experiment Station [Bulletin 



Z 3i 



by early or late springs and falls as well as by the duration of hot 

 weather in midsummer. 



Farm No. 2. Figure 3 contrasts the current consunii)ti()n with na- 

 tural outside temperatures for the years 1924, 1925, and 1926 on Farm 

 No. 2. (Average weekly temperatures from United States Weather 

 Bureau Station at Durham, New Hamjishire, 32 miles northeast of 

 fann, April 2nd to June 7th. Readings from June 7th to November 

 11th were taken with a local thermometer.) Near the middle of March 

 of each year it will be noticed that the temperature curve is rising to 

 between 40° and 45° and refrigeration becomes necessary. Antici- 

 pating this the machines are started some time in advance. About 

 June first the warm weather starts, with maximums occuring in July 

 or possibly August. The current consumption curve rises in the same 

 manner but reaches its peak in July with the bulk of the high, main- 

 tained load from June 1st to September 1st. 



As soon as fall temperatures start to drop noticeably in September 

 and October, the current consumption shows the same tendency to de- 

 cline. When natural temperatures less than the 40° -45° point are 

 assured, the current is shut off. 



It will be noticed that the kilowatt-hour curves for 1924 and 1925 

 (Fig. 4) come to pronounced peaks, indicating some maximum condi- 

 tion. While hot summer weather appeared responsible for this, it 

 seemed that the peaks were somewhat more pronounced than neces- 

 sary. A careful inspection of the room disclosed a number of through 

 leaks in the cork insulation due to carelessly made joints or other 

 inattention to this very important part of the construction work. These 

 were chinked in, and several layers of fibrous insulating board 

 applied over thin or weak sections of the wall and floor. The refrig- 

 erator door, built by a local carpenter, which had been assumed to be 

 insulated in some way, was torn open and found to contain only an 

 air space and a piece of building paper. This was filled with many 

 layers of the same insulating wall board. Cracks around the door 



Fig. 4. Kwhr. curves for three years on Farm No. 2 show how consumi)trion var- 

 ies with yearly differences and how it can be lowered by proper insulation 

 (see 1926 curve). 



