As he took Mac's aneroid barometer out of his pocket, a sudden gust cut across his raw and bleeding cheek.

"I determined the descent from the summit to Lake Lindeman by carrying the aneroid from the lake to the summit and back again, the interval of time from start to return being about eight hours.

While making the survey from the summit down to the lake I took the angles of depression of each station from the preceding one, and from these angles I deduced the difference of height, which I found to be 1,354 feet, or 117 feet more than that found by the aneroid.

In addition to these I had secreted a prismatic and magnetic compass, a boiling point and aneroid thermometer, and a plane-table which I had constructed for the occasion.

The mean of our observations with the Aneroid barometer gives 575 feet for the elevation of this part of the river above the sea.

At the highest point on this day's route the aneroid stood at 29.40, and at the camp 29.55; thermometer, 88 degrees.

Adjusted the aneroid barometer.

Fragments of trap-rock are frequent in the bed of the river, and one specimen contained traces of carbonate of copper; at 6.0 thermometer 92 degrees, aneroid 29.80, at the campsixty feet above the river.

At noon the thermometer stood at 100 degrees in the shade, and the aneroid 29.75forty feet above the river.

The aneroid stood at 29.15; thermometer 94 degrees.

The soil was sandy with acacia scrub, paper-bark gum, stringybark, and bloodwood; at 10.0 the country became stony, with white-gum, tall acacia, and triodia, and we gradually ascended till the aneroid indicated an elevation of 1100 feet, and we appeared to be on a ridge parallel to the tableland of the interior and at a greater elevation; at 1.20 p.m. observed a clump of melaleuca in a deep rocky ravine, and steered south to it.

At 6.45 a.m. steered south-east and soon ascended a rocky range of altered sandstone and trap or basalt, thinly wooded with white-gum, tall acacia, and grevillia, triodia, and treraphis superseding the grass; at 7.30 the aneroid indicated the greatest altitude (1300 feet) which we had attained since leaving the Victoria River.

2 Aneroid Barometers : 7/0/0.

The instruments employed were an eight-inch sextant, box-sextant, prismatic compasses, pocket compasses, double axis compass, aneroid barometers, thermometers, and artificial horizon, etc.

Unslinging the aneroid which I had been carrying, I found to my surprise and dismay that the needle showed a height of only 21,525 feet above sea level.

Tucker's aneroid read more than a thousand feet higher, 22,550 feet, but even this fell short of Raimondi's estimate of 22,775 feet, and considerably below Bandelier's "23,000 feet."

A course is easily found by using an aneroid, or it may also be worked off the Ordnance Map.

Set the aneroid at the point you start from and check your heights by this as you climb or descend, referring constantly to the map to ensure that you are running on the right line.

Having an aneroid barometer with us, we ascertained the elevation of the mountain to be about 9,800 feet.

At this point the elevation, as indicated by our aneroid barometer, was 9,476 feet, while at the summit it was 10,327 feet, a difference of 581 feet, which was the broken granite summit.

Corrected Aneroid.

At lunch my aneroid reading over scale 12,250, shifted hand to read 10,250.

We descended 2500 feet, measured by my aneroid, to the flat, where the monks made us most welcome.

p. 73) will find the average quantity of rain fallen at Greenwich, for twenty-five years, 1815 to 1839, in a very useful and clever pamphlet, price 1s., by J.H. Belville, of the Royal Observatory, published by Taylor, Red Lion Court, Fleet Street, called Manual of the Mercurial and Aneroid Barometers.

ANEROID, a barometer, consisting of a small watch-shaped, air-tight, air-exhausted metallic box, with internal spring-work and an index, affected by the pressure of the air on plates exposed to its action.