CO537-(36-37) — Page 289

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:

M. 5. Mu

17357

2141.

Mithrigh and

16

There is an authority I want to quote to you, which 17357 contains a suggestion you may or may not have known of. (Burnell's "Limes, Cements and Mortars &c." page 37).

"At Utrecht, and in Holland generally, oyster shells are burned in large quantities for the purpose of obtaining lime; but as the carbonate of lime they contain exists in a great state of purity, the lime is too rich to be employed without the admixture of trass

puzzolano".

A.

Q.

That would be similar to what is known here as kaolin. Could we not find a substitute for this trass puzzalon, 173572

and that would meet the case?

A.

We have it now, but we treat it a an adulterant, Canton lime that comes down from the north, rather from the Pearl River, not the West River.

•

the

52 2.

Stone lime, are you speaking of ?

17353

A.

·

The Chairman:-

54

A.

No, it is supposed to be oyster shell lime. I am not speaking of my own knowledge, but of what is told me by the contractors. They constantly bring this lime here.

It is not white, it is a yellowish ecleur, and our teste

of that lime go to shew that it is adulterated with a

very large proportion of white clay, and we are

unable to get that lime to set at all. We have tried it

with sard and red earth of various kinds.

Is it ever adulterated with clay ?

17354

My opinion is that it is about 75% of clay, and 25% of

oyster shell lime, so that I am not very much in favour.

of using any local puzzajono or olay, with a view to assisting in slaking the line. The lime reaches us practically slaked.

Er Shelton Hooper:- Now, the ordinary lime concrete made here with red 173 »

earth, there is a certain amountof hydraulicity in the

''

red sarth, lant there ▼

A.

Yes, in some kinds of red earth,

PUBLIC RECORD OFFICE

Reference:-

NGO 537.

37

RECORD OFFICE, LONDON

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