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be it remembered I am not now giving results of assays, but only imaginary examples.

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1 part bone-coal reduced 10.00 parts by weight of lithage "rough bituminous" 12.50 "good bituminous" 20.00 46 anthracite

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Table of Analyses of different Clays, from which the most approved Crucibles are made.

Silica.

Alu- Magmina. nesia.

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Stamming

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ton, England, by 42.0 40.9 0.1 1.3 Trace 14.7 Le Play.

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Table showing, in Degrees of the Centigrade and Fah renheit Thermometers, the Amount of Heat necessary to melt various Substances.

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Table of Troy Weights used with Gold, and Silver, and

Platina.

24 grains (gr.) make 1 pennyweight (dwt.)

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The value of gold is given in carats fine, 24 c. f. being pure.

One pound of gold 24 carats fine contains 5760 grs. of pure gold, as gold of that number of carats fine is unalloyed.

One pound of gold 23 carats fine contains 5520 grs., and so on, and one oz. of gold 20 c. f. has 400 grs.

one dwt. of gold 15 c. f. has 15 grs.

These are given as examples of the manner in which the amount of the pure metal ought to be calculated.

Table of Avoirdupois Weights used with other Metals.

(Tun,) (Hundredweight) (Quarter) (Pound) (Ounce)

Oz.

(Dram) dr.

2240 = 35840573440

112 = 1792 = 28672

lb.

T.

cwt.

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A Table of Comparison of Twelve different National

Pound Austrian Bavarian Saxon (or Wurtemburg Old Cologne Avoirdupois. Pound. Pound. Soll.) Pound. Mark.

Pound.

1

0.80998 0.81000 0.90720 0.96979 1.94001 9.90847 9.90848 9.95770 9.98668 0.28780

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0.51546 0.41751 0.41752 0.46762 0.49989 9.71220 9.62067 9.62068 9.66990 9.69887

1

1.10078 0.89160 0.89162 0.99862 1.06752 2.13551 0.04170 9.95017 9.95618 9.99940 0.02838 0.32950

0.93770 0.75952 0.75953 0.85068 9.97206 9.88054 9.88055 9.92977

0.90937 1.81915 9.95874 0.25987

1.07916 0.87410 0.87412 0.97901 1.04656 2.09359 0.03309 9.94156 9.94157 9.99079 0.01976 0.32089

2.20460 1.78568 1.78571 2.00000 2.13800 0.34333 0.25180 0.25181 0.30103 0.33001

4.27693

0.63113

0.90283 0.73127 0.73129 0.81904 9.95560 9.86408 9.86409 9.91331

1.03111 0.83518 0.83520 0.93542 0.99996 2.00037 0.01331 9.92178 9.92179 9.97101 9.99998 0.30111

0.87555 1.75149 9.94228 0.24341

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