TABLE of ALLOYS, SOLDERS, and AMALGAMS, EMPLOYED in the ARTS.

BY M. CHAUDET, ASSAYER OF THE MINT, PARIS.

Bronze medals, cast (these wear a long time) Copper, 92; tin, 8.

Jewellery-French standard

..

Gold coin-United States standard

Silver plate

Silver coin

ditto

ditto

ditto

Gold coin-English standard..

Silver coin

Imitation gold

Imitation silver (Chinese Packford)..
For cannon

Statues (Keller's)

Bronzes and candelabras
Mounting of fire-arms..
Cymbals, Chinese gongs, &c...

This alloy is very hard; it is annealed by
then malleable; whilst, if suffered to
Bells

Reflectors of telescopes..

Brass for lathes ..

Brass for the hammer

Types

Gold, 750; copper, 250.
Silver, 950; copper, 50.

Gold, 899 22; copper and silver, 100.78.
Silver, 892 43; copper, 107.57.

Gold, 916-67; silver and copper, 83.33.
Silver, 925; copper, 75.
Copper, 91; tin, 9.50.

[lead, 0.82. Copper, 61 27; zinc, 28.78; nickel, 15:13; Copper, 100; tin, 11. [lead, 1.37.

Copper, 91.40; zinc, 5.53; tin, 1.70;
Copper, 82.00; zinc, 18'00; tin, 3:00;
Copper, 80; zinc, 17; tin, 3. [lead, 1.50.
Copper, 80; tin, 20.

dipping, while red-hot, into water, and is
cool gradually, it is excessively hard.

Copper, 75; tin, 25.

Copper, 2; tin, 1.

Copper, 65.80; zinc, 31.80; lead, 2·15.
Copper, 70 10; zinc, 29.90.

This is an important alloy, first made by M. Chaudet.

Alloy fusible in boiling water..

Plugging teeth

..

For tinning iron..

Lead, 80; antimony, 20.
Bismuth, 8; lead, 5; tin, 3.

Bismuth, 8; lead, 5; tin, 3; mercury, 16.
Tin, 8; iron, 1.

To make ductile gold of 18 carats, 95.0 fine Gold, 990; copper, 10.

This amalgam is hard, and melts at a low heat; it was used by Fouché for the pur

pose of opening and resealing letters.

Silvering mirrors

Silvering globes of glass

For cushions of electrical machines..

The proportions are, of course, not given.

Tin, 70; mercury, 30.

Mercury, 80; bismuth, 20.
Mercury, 2; tin, 1; zinc, 1.

A very important and useful alloy, employed in the manufacture of philosophical instruments, as a substitute for platinum, to which it is superior in hardness and colour, and yet not oxydizable under ordinary circumstances.

† Another very useful alloy, possessing a degree of elasticity inferior only to steel, combined with the advantages of superior hardness and lightness over platinum.

ANTHRACITE COAL in PENNSYLVANIA.

The development of the Coal Mines in this state appears to be progressing favourably. The annexed statement will show the produce of the year 1848 from the different localities, as compared with the preceding year :

Chals. Tons.Cwt. Chals. Tons. Cwt. Chals. Tons. Cwt. Chals. Tons. Cwt.

The LONDON IMPERIAL COAL MEASURE converted into WEIGHT.

Chals. Tons. Cwt. Chals. Tons. Cwt. Chals. Tons. Cwt. Chals. Tons. Cwt.

The Ton, 20 cwt.

RELATIVE PRICES OF COALS.

The Imperial Chaldron, 25 cwt.

Ton. Imp. Chal.New.Chal. Ton. Imp. Chal. New.Chal.

The Newcastle Chaldron, 53 cwt.

Ton. Imp. Chal.New.Chal. Ton. Imp. Chal.New.Chal.

STANDARD PRODUCE and PRICE.

The Standard not being generally understood, or the rule whereby the price of ore, of a given produce sold at a certain standard, can be ascertained, as well as the standard at which ore sells, the produce and price of which are given, we are induced to give the following form, which is in itself so simple as to require no explanatory remarks.

Question 1.-What is the price per Ton of Copper Ore the produce of which by assay is 8, at the Standard of £94 8 0?

Question 2.-What is the Standard at which Ore sells, the price being £5 17