Box 12, Folder 2: Increase Lapham Correspondence for 1875

Chamberlin's Spring Beloit Wis Copy New York, April 1 1875

[table of compounds found in spring, measured in grains per one gallon]

Same spring that was analyzed by Bode in 1874

C.F. Chandler Ph.D. Professor of Analytical and applied Chemistry

Prof. T.C. Chamberlin Beloit, Wis.

Milwaukee Brick

Madison April 2nd 1875

Dr. I.A. Lapham

Dear Sir

I have analyzed the specimens of Milwaukee Brick Clay which you sent in some time ago, and as it is a very remarkable clay on account of the very large proportion of carbonate lime and magnesia which it contains, I thought perhaps you would like the result. I accordingly sent it. If it will not be too much trouble for you to send me a few facts in regard to the manufacture of brick at Milwaukee, I would be very much obliged if you would do so. I would like to learn about how much sand is put in and mixed at with the clay before the bricks are pressed, also how long and how

hot the kilns are heated in burning the bricks, I suppose of course they are burned in the air! I would like also to know about how many are burned in a kiln, and the approximate number annually manufactured, also whether they are moulded [molded] by hand or machinery, if by hand about how many are moulded [molded] by each moulder [molder], and if by machinery, which machine is used. Anything else you may happen to think of I would be very much obliged to have you tell me. I am thinking of getting up a little paper upon the subject—for the mining and engineering journal.

Yours very Respectfully E.T. Sweet

Why not

Carbonate of Lime 4.35 Dolomite{ Carb. lime 18.85; Carb. Mag 15.83 34.68 39.03

The 4 pr ct iron ore shows that the cream is not owing to the absence of iron!

Analysis of Milwaukee Brick Clay Sampled by Dr. I.A. Lapham

[table]

II. Percent of each constituent found

II A. Same, regarding all of the magnesia combined with carbonic acid and the remainder of the carbonic acid combined with lime, which is probably the case. The extra lime is doubtless there as silicate.

E.T. Sweet