194 [ASSKMKLY 



would be p]« asod if (he Institute would express in a more suitable 

 way, its sense of the service rendered the j)ublic by Mr, Russ, in 

 what he has done towards an improvement in the pavement of our 

 streets. 



(Signed,) HORATIO AI.LEN, 

 JNO. 13 JERVIS, 

 JOHN D. WARD, 



Committee. 



Mode of Constructing the Russ Pavement. 



When the subsoil is jrraded and ready, a quantity of granite or 

 other mason or quarry chips, each from idur to six or eight inches in 

 diameter, and about half that thickness, are to be Iniil with the flat- 

 test side upwards, and rammed down flush with the gjading, so as to 

 form an open heading or partial pavement foundation for the next 

 part of the work. This is to be proceeded in as follows: 



The positions of the sewers, pipes and branches are defined, and 

 metal or wood fiaraes, thicker at the bottom than the top, laid so as 

 to circumscribe a space or spaces, forming a panel or panels over 

 each sewer pipe and branch beneath, and may be made of sound 

 wood, though common cast iron, or iron-str,ne pottery, burnt earth, or 

 any other fit material mny be used for the frame pieces. Then a pro- 

 per set of open wooden, shallow vats are to be prepared, for mixing 

 in them what is now well known by the technic«^l name of ^^concrete,^^ 

 namely, a mixture of mnsons' chips, bro en stones, hydraulic cement, 

 clean sand, (not salt beach sand,) and fresh water, in such proportions 

 as the quality of the cement will require to form a sound foundation 

 above the subsoil, that will in a short time become an artificial flag 

 or slab of rock about eight inches thick, to bear the pavements above; 

 but before the mixture is placed into the panels or sections formed 

 by the frames; those panels that, may hereafter have to be lifted 

 out for access to the parts beneath, are to have bars of iron laid into 

 them, forming crosses with the holes in them, through which they 

 are to be united by an eye bolt with a ring in (he head of each bolt,, 

 and in the larger panels two or more of these sets of bars, bolts 

 and rings may be used, while on the smaller panels one will be suf- 

 ficient. The bolts employed lor these purposes may be of a small 

 extra length. that will find a place in the subsoil, and a countersink 

 in the f;;ce of the concrete is (o receive the ring. In (his way, on 

 applying power to raise the pane!, the ring will lift clear of the face 

 "without breakage or injury to the concrete. Then the concrete 



