10 metres equal 33 feet (approximately).
50 " " 164 "
100 " " 328 "
250 " " 820 "
500 " " 1,640 "
1,000 " " 3,281 "
2,000 " " 6,562 "
3,000 " " 9,843 "
A compass is, of course, useful when running by map, but as precipices are apt to get in the way when running straight for any given point, a compass cannot be trusted alone. In the case of fog, it is very difficult to avoid difficulties, and points on the map can only be identified by the use of an aneroid, as well as a compass. 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. It is wise to practise this on clear days in order to get accustomed to running by map, compass and aneroid. As the weather also affects the aneroid, it should be constantly reset at known levels.
All this may sound very confusing, and most beginners will probably prefer to take a Guide who knows his country well rather than trust to elementary map-reading knowledge in unknown country. Most runners who go on tour will find running much more interesting, however, if instead of following a Guide blindly they also watch the map or get a knowledge of what is good or bad country to run over. There are sometimes cases also when the party must necessarily divide, and an amateur may have to take the lead over unknown country.
AVALANCHES
Much has been written on this subject. Mr. Arnold Lunn, in "The
Alps," tells some extraordinary stories about these monsters of the
mountains. My father, John Addington Symonds, in "Our Life in the
Swiss Highlands," also describes them.
There was a very interesting article by Monsieur F. Krahnstoever in the "Swiss Ski Club Year-Book for 1923" on the subject of avalanches in relation to Ski-ing. They are an everlasting nightmare to Ski runners in high places, and beginners should at once take care to learn all they can of snow-craft in order, in so far as possible, to realize what is safe and what is dangerous.
The steepness of slopes and the condition of snow, as well as the direction of wind, are all factors affecting avalanches.
Any slope whose gradient is more than 15° may be dangerous under certain conditions, but it may be generally accepted that most long slopes under 25° are comparatively safe so long as they have not much steeper slopes immediately above or below them.
New snow is always apt to slip before it has had time to settle down. Snow blown by wind into a cornice or overhanging lip at the top of a slope or on a cliff may topple down and start an avalanche.
Wet snow, after rain, or a warm Föhn wind, becomes heavy and begins to slide.