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Table 157.-WEIGHT of ONE Foot IN LENGTH of SEAMLEss DRAwN Copper TUBEs. (MUNTz's METAL Co., LIMITED.)

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To find the weight of a copper tube of a given external diameter, subtract the factor at the bottom of the Table from the weight of a tube of similar internal diameter. For instance, the weight of a copper tube 2 inches external diameter, of Io I.S.W.G. in thickness, is = 3-29 – 40 = 2.89 pounds per foot in length.

The Tenacity of Ordinary Copper Tubes is about 15 tons per

square inch.

A copper tube by Muntz's Metal Company, Limited, was analysed and found to consist of 99.86 per cent. of copper; or 3 per cent. of arsenic; 'oz I per cent. of antimony; o;0 per cent. of bismuth; -ojo per cent. of lead; 'ooz per cent. of iron; and traces of silver and nickel.

Specially hardened copper tubes are made for locomotive boilers.

They

are nearly twice as durable as brass tubes, and have a higher heat-conductivity.
Their tensile strength is from 20 to 22 tons per square inch.
Table 158.-APPRoxIMATE WEIGHT of ONE Foot IN LENGTH of CAst
GUN-METAL TUBEs or CYLINDERS For BUSHEs or BEARINGs of SHAFTs.
CoMposition CoPPER 84 PFR cFNT. AND TIN 16 PER CENT.

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Table 159.-APPRoxIMATE WEIGHT IN Pounds of ONE Foot IN LENGTH of CAST ANTI-FR1ction WHITE-METAL TUBEs or CYLINDERs For DUSHEs or BEARINGs of SHAFTs AND oth ER PURPoses, REPRESENTING THE Ave RAGE WEIGHT of sever AL CoMpositions of TIN, ANTIMONY, AND CoppER.

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Table 161.-W. EIGHT OF ONE Foot IN LENGTH OF NAVAL-BRAss TUBEs.

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Weight of Wrought-Iron Tubes for Gas, Steam, and Water.— These tubes have distinctive colours. Water tubes are painted blue, steam tubes red, and gas tubes are black.

Water tubes are one gauge thicker than gas tubes, and steam tubes are two gauges thicker than gas tubes.

All tubes are tested by hydraulic pressure as follows:–Black gas tubes, 100 lbs. ; galvanized gas tubes, 300 lbs. ; blue water tubes, 200 lbs. ; galvanized water tubes, 400 lbs. ; red steam tubes, 5oo lbs. ; galvanized steam tubes, 500 lbs. per square inch. Table 162.-WEIGHT OF WROUGHT-IRON TUBES FOR GAS AND STEAM.

(LLoyd & LLOYD.)

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Galvanizing tubes increase their weight from 3 to 6 per cent. It is a great preservative against rust, and renders the tubes extremely durable, but the process of galvanizing makes the iron somewhat brittle.

Table 163.-WEIGHT of ONE Foot IN LENGTH of LAP-WELDED WRoughtIron TUBEs. (A. & J. STEwART.)

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