34 



Mr. White on Calcareous Cements. 



sand, one part chalk lime, crumbled to pieces on attempting to 

 place them. 



The Seventh Pier (G) was composed of Atkinson's Roman ce- 

 riient one part, pure sand one part. 



Weights being carefully and successively applied at A, half a 

 hundred at a time ; it supported five hundred weight, and broke 

 under five and a half hundred weight at B ; on examining the 

 separated parts, it was evident that the mortar had not equally 

 adhered to every brick 



The largest end being tried in the same way as in the first ex- 

 periment, viz. 



It was left nearly half an hour with one ton weight at A, and 

 broke in consequence of a shock it experienced by the breaking of 

 the pier subjected to the next experiment. 



The Eighth Pier (H) four parts Pozzolano, and one part air- 

 slacked stone Mme. This broke in laying down. A second expe- 

 riment was made as in the preceding pier, itf supported five and a 

 half hundred weight, and broke in two pieces. 



The Ninth Pier, built of rough lumps of Pozzolano, in imitation 

 of Roman walling, nine parts Pozzolano, and one and a half parts 

 stone lime, was not sufficiently dry to be experimented upon. 



