Best form for Memoranda.--I have remarked that almost every traveller who
is distinguished for the copiousness and accuracy of his journals, has
written them in a remarkably small but distinct handwriting. Hard
pencil-marks (HHH pencils) on common paper, or on metallic paper are very
durable. Dr. Barth wrote his numerous observations entirely in
Indian-ink. He kept a tiny saucer in his pocket, rubbed with the ink;
when he wanted to use it, he rubbed it up with his wetted finger-tip, or
resupplied it with fresh ink, and filled his pen and wrote. Captain
Burton wrote very much in the dark, when lying awake at night; he used a
board with prominent lines of wood, such as is adopted by the blind. It
is very important that what is written should be intelligible to a
stranger after a long lapse of time. A traveller may die, and his
uncompleted work perish with him; or he may return, and years will pass
by, and suddenly some observations he had made will be called in
question.
Professor J. Forbes says:--"The practice which I have long adopted is
this:--to carry a memorandum-book with Harwood's prepared paper" (in this
point of detail I do not concur; see next paragraph) "and metallic
pencil, in which notes and observations and slight sketches of every
description, are made on the spot, and in the exact order in which they
occur. These notes are almost ineffaceable, and are preserved for
reference. They are then extended, as far as possible, every evening with
pen and ink, in a suitable book, in the form of a journal; from which,
finally, they may be extracted and modified for any ultimate purpose. The
speedy extension of memoranda has several great advantages: it secures a
deliberate revision of observations, whether of instruments or of nature,
whilst further explanation may be sought, and very often whilst
ambiguities or contradictions admit of removal by a fresh appeal to
facts. By this precaution, too, the risk of losing all the fruits of some
weeks of labour, by the loss of a pocket-book, may be avoided."
It has occurred to me, frequently, to be consulted about the best was of
keeping MSS. Captain Blakiston, who surveyed the northern part of the
Rocky Mountains, and subsequently received the medal of the Royal
Geographical Society, for his exploration and admirable map of the
Yang-tse-Kiang, in China, paid great attention to the subject: he was
fully in possession of all I had to say on the matter; and I gladly quote
the method he adopted in North America, with slight modifications,
according to the results of his experience, and with a few trivial
additions of my own. For the purposes of memoranda and mapping data, he
uses three sets of books, which can be ordered at any lithographer's:--
No. 1. pocket Memorandum Book, measuring three inches and a half by five,
made of strong paper. (Captain Blakston did not use, and I should not
advise travellers to use, "prepared" paper, for it soon becomes rotten,
and the leaves fall out; besides that, wet makes the paper soppy.) The
books are paged with bold numbers printed in the corners; two faint red
lines are ruled down the middle of each page, half an inch apart, to
enable the book to be used as a field-surveyor's book when required. In
this pocket=book, every single thing that is recorded at all, is
originally recorded with a hard HHH pencil. Everything is written
consecutively, without confusion or attempt to save space. There may
easily be 150 pages in each of these books; and a sufficient number
should be procured to admit of having at least one per month. Do not
stint yourself in these.
No. 2. Log-Book.--This is an orderly way of collecting such parts of the
surveying material as has been scattered over each day in your note-book.
It is to be neatly written out, and will become the standard of future
reference. By using a printed form, the labour of drawing up the log on
the one hand, and that of consulting it on the other, will be vastly
diminished. I give Captain Blakiston's form, in pages 28, 29, and I would
urge intending travellers not to depart from it without very valid
reasons, for it is the result of considerable care and experience. The
size in which the form is printed here is not quite accurate, because the
pages of this book are not large enough to admit of it, but the
proportion is kept. The actual size is intended to be five and a half
inches high and nine inches wide, so that it should open freely along one
of the narrow sides of the page, in the way that all memoranda books
ought to open. Four pages go to a day; of these the pages 1 and 2 are
alone represented in this book, pages 3 and 4 being intended to be left
blank.
[P 28 and p 29 show samples of the log book pages being described].
The bold figures 17 and 18 in the right-hand corners of the form I give,
show how the pages should be numbered. The lines in p. 18 should be faint
blue.
No. 3. Calculation Book.--This should be of the same size and shape as
the Log Book, and should contain outline forms for calculations. The
labour and confusion saved by using these, and the accuracy of work that
they ensure, are truly remarkable. The instruments used, the observations
made, and especially the tables employed, are so exceedingly diverse,
that I fear it would be to little purpose if I were to give special
examples: each traveller must suit himself. I will, therefore, simply
make a few general remarks on this subject, in the following paragraph.
Number of Observations requiring record.--A traveller does excellently,
who takes latitudes by meridian altitudes, once in the twenty-four hours;
a careful series of lunars once a fortnight, on an average; compass
variations as often; and an occulation now and then. He will want,
occasionally, a time observation by which to set his watch (I am
supposing he uses no chronometer). He ought therefore to provide himself
with outline forms for calculating these observations, even if he finds
himself obliged to have them printed or lithographed on purpose; and in
preparing them, he should bear the following well-known maxims in mind:--
Let all careful observations be in doubles. If they be for latitudes,
observe a star N. and a star S.; the errors of your instruments will then
affect the results in opposite directions, and the mean of the results
will destroy the error. So, if for time, observe in doubles, viz., a star
E. and a star W. Also, if for lunars, let your sets be in doubles--one
set of distances to a star E. of moon, and one to a star W. of moon.
Whenever you begin on lunars, give three hours at least to them, and
bring away a reliable series; you will be thus possessed of a certainty
to work upon, instead of the miserably unsatisfactory results obtained
from a single set of lunars taken here and another set there, scattered
all over the country, and impossible to correlate. A series should
consist of six sets, each set including three simple distances. Three of
these sets should be to a star or stars E. of moon, and three to a star
or stars W. of moon. Lunars not taken on the E. and W. plan are almost
worthless, no matter how numerous they may be, for the sextant, etc.,
might be inaccurate to any amount, and yet no error be manifest in their
results. But the E. and W. plan exposes errors mercilessly, and also
eliminates them. One of the best authorities on the requirements of
sextant observations in rude land travel, the Astronomer Royal of Cape
Town, says to this effect:--"Do not observe the altitude of the star in
taking lunars, but compute it. The labour requisite for that observation
is better bestowed in taking a large number of distances." So much
delicacy of hand and of eyesight is requisite in taking lunars that shall
give results reliable to seven or eight miles, and so small an exertion
or flurry spoils that delicacy, that economy of labour and fidget is a
matter to be carefully studied.
These things being premised, it will be readily understood that outline
forms sufficient for an entire series of lunars will extend over many
pages--they will, in fact, require eighteen pages. There are four sets of
observations for time:--one E. and one W., both at beginning and close of
the whole; one for latitudes N. and S.; six for six sets of lunars, as
described above; six for the corresponding altitudes of the stars, which
have to be computed; and, finally, one page for taking means, and
recording the observations for adjustment, etc. Each double observation
for latitude would take one page; each single time observation one page;
and each single compass variation one page. An occulation would require
three pages in all; one of which would be for time. At this rate, and
taking the observations mentioned above, a book of 500 pages would last
half a year. Of course where the means of transport is limited,
travellers must content themselves with less. Thus Captain Speke, who
started on his great journey amply equipped with log-books and
calculation-books, such as I have described, found them too great an
incumbrance, and was compelled to abandon them. The result was, that
though he brought back a very large number of laborious observations,
there was a want of method in them, which made a considerable part of his
work of little or no use, while the rest required very careful treatment,
in order to give results commensurate with their high intrinsic value.