- too much. Too hot by half, if the degree of heat was to ascend so high—in which case we should certainly be cooked—not enough, if we wanted to ascertain the exact temperature of springs or metal in a state of fusion.
- A manometer worked by compressed air, an instrument used to ascertain the upper atmospheric pressure on the level of the ocean. Perhaps a common barometer would not have done as well, the atmospheric pressure being likely to increase in proportion as we descended below the surface of the earth.
- A first-class chronometer made by Boissonnas, of Geneva, set at the meridian of Hamburg, from which Germans calculated as the English do from Greenwich.
- Two compasses, one for horizontal guidance, the other to ascertain the dip.
- A night glass.
- Two Ruhmkorff's coils, which, by means of a current of electricity, would ensure us a very excellent, easily carried, and certain means of obtaining light.
- A voltaic battery on the newest principle.
Our arms consisted of two rifles, with two revolving six-shooters. Why these arms were provided it was impossible for me to say. I had every reason to believe that we had neither wild beasts nor savage natives to fear. My uncle, on the other hand, was quite as devoted to his arsenal as to his collection of instruments, and above all was very careful with his provision of fulminating or gun cotton, warranted to keep in any climate, and of which the expansive force was known to be greater than that of ordinary gunpowder.
Our tools consisted of two pickaxes, two crowbars, a silken ladder, three iron-shod Alpine poles, a hatchet, a hammer, a dozen wedges, some pointed pieces of iron, and a quantity of strong rope. You may conceive that the whole made a tolerable parcel, especially when I mention that the ladder itself was three hundred feet long!
Then there came the important question of provisions. The hamper was not very large but tolerably satisfactory, for I knew that in concentrated essence of meat and biscuit there was enough to last six months. The only liquid provided by my uncle was scheidam. Of water, not a drop. We had, however, an ample supply of gourds, and
