manganin

Like German silver, manganin changes in resistance on winding, and coils made of it require to be artificially aged by heating to 150° for five hours before final adjustment.

On Laboratory Arts

After annealing as for manganin it can be made into serviceable standards which do not change more than a few thousandths per cent.

On Laboratory Arts

On the whole, manganin appears to be the best material for coil boxes and "secondary" resistance standards.

On Laboratory Arts

Two coils of manganin wire run in the paraffin at opposite sides of the bulb (outside the field of vision), coupled to brass terminals on the wooden frame by platinum wire fused into the glass.

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Other experiments in which the manganin wire was immersed in paraffin oil did not exhibit this effect, though stronger currents were passed.

On Laboratory Arts

The method of treatment above described suffices to render coils of manganin constant for at least a year (in 1892 the tests had only been made for this time) within a few thousands per cent.

On Laboratory Arts

The direct current furnished the building is caused to pass through a variable resistance for adjusting minor variations in voltage and then through the mil-ammeter into a manganin resistance-coil inside the chamber, having a resistance of 84.2 ohms.

Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man

Two leads from the terminals of the manganin coil connect with the voltmeter outside the chamber, and hence the drop in potential can be measured very accurately and as frequently as is desired.

Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man

At present the best results have been obtained by using enameled manganin wire.

Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man

To vary the current passing through the manganin heating coils in the air-spaces next the zinc wall, a series of resistances is installed connected directly with the rheostat R_ {2} in fig. 17.

Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man