SCIENTIFIC OUTFIT. 
7 
of the usual cumbrous tables, confining himself to ordinary- 
tables of logarithms. But all travellers should be furnished with 
a complete set of tables, because they afford at a single reference, 
what otherwise requires additional trouble to obtain. 
‘ Nautical Almanac * for current and future years, strongly stitched 
in cloth. 
Some small Almanacs, such as f Whitaker’s/ contain tables of the 
position of sun and planets, and of stars to be occulted. One of 
these is useful to afford what is necessary to take on a detached 
expedition, the required pages being cut out of it. 
More extended barometric tables than are given in this volume may 
be procured at the instrument makers, or cut out from Guyot’s 
elaborate Meteorological tables, published by the Smithsonian 
Institution, New York. 
Blank maps, ruled for the latitudes and longitudes of the proposed 
route. 
The best maps obtainable of the country you propose to visit. 
Admiralty Manual of Scientific Enquiry. 
Mem. Chauvenet’s Astronomy (New York, 2 vols.) is one of the 
most complete and thorough of the mathematical works on astro- 
nomical observations; it is, however, a book for previous study, 
rather than for reference in the field. 
Instruments Requisite for Detailed Surveys. 
Theodolites~(See p. 23 et seq .) 
Mercurial Barometers —(Y ol. II., p. 25 et seq.) 
Barometers of Fortin’s pattern were successfully carried to great 
heights by Mr. Whymper, in South America; but the risk of 
breakage, at all times very great, is proportionally greater on 
longer journeys. Care should be taken to see that all barometers 
read low enough to be used at great elevations. The form of 
barometer devised by Prof. Norman Collie is very portable. 
Telescope for observation of occupations and eclipses of Jupiter’s satellites 
(see pp. 169 and 202). One with a two-inch object glass, clear 
