376 On the intended Thames Archway 



The first premium to be paid within three months after 

 the plan shall have been put iu execution. The second 

 premium within three months after the tunnel shall have 

 been opened for passengers. 



The plans to be accompanied with full and clear specifi- 

 cations and directions how to carry them into execution, 

 and an estimate of the expense. They must be signed by 

 fictitious names, -mottoes, or marks, and will be returned if 

 not adopted to any person claiming them under the fictitious 

 name, motto, or mark ; the real name to be enclosed in a 

 sealed note, and externally marked with the fictitious name, 

 &c; which note shall not be opened unless it be that of 

 the person whose plan shall be adjudged entitled to the 

 premium. 



All the plans will be submitted to the judgement of emi- 

 nent and competent persons chosen by the directors, who 

 shall not be either proprietors or competitors ; so that every 

 person offering plans may rely upon the fairness and impar- 

 tiality of the decision. 



The plans must be delivered at the office of Mr. Wadeson, 

 in Austin Friars, London, solicitor to this concern, on or 

 before the first of June next. 



To enable engineers and others to form correct opinions 

 on the subject, the directors have caused the following ac- 

 count of such facts as were noted to have- occurred in the 

 progress of the undertaking, to be extracted from the en- 

 gineer's journal, which is accompanied by an engraving 

 showing the plan and section of the works as far as they 

 have proceeded. 



Fig. l, (PI. XT.) is the section of the river, shaft, and 

 ^drift-w iy, B the shaft on the south shore lined with nine- 

 jnch brick-work laid in cement impervious to water. The 

 strata through which it passed consisted of, 



Ft. In. 



1 . Brown clay 9 



2. Loose gravel with a large quantity of water 26 8 



3. Blue alluvial earth inclining to clay ...... 3 



4 . Loam 5 1 



5. Blue alluvial earth inclining to clay, mixed 



with shells ....................... 3 9 



0, CaL- 



