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Using some channel iron found behind the machine shop, we built what looked like a miniature oil derrick and placed it over the scale as a brace for a tube that held the rocket.

Combination steel and wood reaches, the sides being of channel iron and the center of wood, are favored by some operators.

"The German ironmasters," writes Prof. Milloud, "sell their girders and channel iron for 130 marks per ton in Germany, for 120 to 125 in Switzerland; in England, South America and the East for 103 to 110 marks; in Italy they throw it away at 75 marks and make a loss of from 10 to 20 marks per ton, for the cost price may be reckoned at 85 to 95 marks per ton."

The apparatus is mounted on a stand at a convenient height for handling the bottles; and in front is another stand with channel iron rails to take the waggon in which the bottles or jars to be sterilised are packed.

Two pieces of channel iron are attached to these legs and the structural framework of the calorimeter chamber rests upon these irons.