30 Travel and Equipment 
(1) Aneroid, Watch, Silk Rope and Whistle. 
The most convenient sized aneroid for ordinary work is one 
with a 12 in. dial (watch size). For general use one which shows 
altitudes on the external ring over a range of 5,000 feet is most 
suitable since it permits of clear graduation by which differences in 
level can be read to within ten feet with little trouble. Of course 
for work in higher mountains an aneroid must be graduated to 
show heights up to 10,000 feet at least, but thereby the difficulty 
of reading off the dial is greatly increased and its value for 
determining accurately relative heights proportionately diminished. 
Save when I devote a day to marsh work, I invariably carry 
an aneroid and, apart from the general interest of observing and 
noting the heights of mountains, cliffs, and nesting-places, on occa- 
sions it is of the greatest assistance in finding one’s way on a 
precipitous mountain to some particular point. I will give an 
example. Some twelve years ago I visited a great range of ter- 
raced cliffs and noted a Vulture’s nest at a certain point. But 
on setting to work to climb the cliff I soon lost my bearings amid 
the numerous gullies, projecting crags and ledges which at every 
turn hindered my advance or led me whither I did not wish to go. 
As frequently occurs in big climbs, I was soon completely at fault 
and had no idea whether I should try to go higher or lower along 
the face of the cliff and eventually had to abandon the attempt. 
On the occasion of my next visit I reconnoitred the cliff more 
carefully and took the precaution of noting down a few points 
on the same level as the nest before setting to work to climb. 
On reaching one of these landmarks, a crag with some olive trees 
on it, | consulted my aneroid and found I had risen about 300 ft. 
I then strove to keep to the same level, but this soon proved to be 
impossible for I had to ascend in some places over too ft. and 
at others work downwards along steeply sloping strata, amid a 
5 
