34 N. H. EXPERIMENT STATION [Bulletin 319 



Engineering 



Control of Moisture in Poultry Litter 



(See under Ponllry Husbandry) 



Potato Storage Structures 



Studies were l)eg'un in the summer of 1939 l)y W. T. Ackerman to 

 determine the structural requirements and engineering problems in- 

 volved in the construction and equipment for heating, ventilating and 

 humidity control of individual potato storages for average size farm 

 use. Five storages in actual operation on farms in the state were 

 selected. These ranged in type of construction from the very lowest 

 cost attainable, through the average masonry basement with wood 

 super-structure, to the high cost monolithic concrete and steel con- 

 struction. 



The first year's investigations are ])lanne(l to eliminate known 

 causes of heat loss or cold entrance in so far as possible with con- 

 tinuous temperature and humidity readings for the quality of opera- 

 tion, so that further improvement of structural and engineering fac- 

 tors mav be made in the summer of 1940. The cost of construction 

 and structural details as planned will also be obtained and analyzed. 



(Purncll and Bunkhcdd-Joncs Offset Funds) 



Testing and Advisory Service 



Examinations, tests and advisory services on new e(|uipnunt for 

 agricultural and rural use. especiall}' in the electrical field, served to 

 protect both merchandiser and consumer from costly mistakes in ex- 

 ])erimenting with new devices, report W. T. Ackerman and G. JNI. 

 Foulkrod. Xew types of tractors, a traction dynamometer, home- 

 Iniilt electric lirooders. \vater-sup])ly i)umi)s (compressed air jet and 

 turbine tvjies). new style flood lights, idtra-violet lamps for poultry, 

 and motor-driven grindstones were under investigation this year. 



fBankhrnd-Joncs Offset Fund) 



Electric Washing and Sterilizing Equipment for Dairy Utensils 



Studies of electrical washing and sterilizing e(|uiinnent w frc lim- 

 ited to ]ireliminary work on three devices. — a cond)ination dairy wa- 

 ter heating-washing-sterilizing unit, a dairy sterilizing cabinet, and 

 an electric dairy water heating pail, rejiorts W. T. Ackerman. 



fBdnhJifdd-Joncs Offset Fund) 



Entomology 



The Penetration of Contact Insecticides 



This fundamental investigation has i)rocecded with a sttul\ of fiu'- 

 ther materials, in addition to those noted in the jireviotis re])ort. A 

 fairl\- large body of data has now l)een accumidated on two jietro- 

 letim derivatives, steam-distilled pine oil. and six alcohols, from 

 methyl to octyl. .Among these various li(|uids maximum penetration 

 '-f insect integiunent was exhibited by a low-boiling pctroleiun de- 

 livative f.'^ to 7 carbons") standardized under the name ".Aiicothin- 



