icc-piw. A Imiuc was over the whole | 

 nihcr for cxcliuliii^; rain than air. T*hc 

 tides of th<* limine were five or nxx feet 

 hieb. The cun c bo 1 up, liui not 



close, and the principal vent was at the top 

 of a pavilion roof. 



S/nrw is a considerable resister or non- 

 conductor of licai. Let it be I nd, 

 and dry. Tread it down close between 

 t!ie logs and hank. Lay an abundance of 

 it upon the ice. The small mass of ice 

 stored in the above insu! ^ . n, 700 feet, 

 was daily used of very freely, and laslfld 

 n^.ir ai long as doui>k' the «, 'ity J 

 lu a cl c ice-pit as Ci);ninonly constructed, 

 and which is on the hill in UnitMi- [^ 

 Ph" ' ' hia ; the earth whereof is dry and 

 gravelly from nrar ihc surface down in the 



bo 



Below is a section, dnrwn of an insulated 

 ii c-pit, diff * " ^ the one abovt^-men- 

 tioncd only in si/c. The pen or cell inside 

 . : the logs, is twelve feet S(|uarc, ten >, 

 and contains 1 f to solid kct. Lhc space 



