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Aviation History
1911
1911 - 0693.PDF
AUGUST 12, 1911. (/ycm] THE AVERAGE WEATHER OF AUGUST. By T. F. AUGUST closely resembles July in the principal weather phenomena, but there is an increase of fogs and a decrease in the number of thunderstorms, while, of course, the hours of daylight gradually diminish. On the whole it seems to be as good a flying month as July. But whether this particular August, following such a long spell of fine weather, will approximate to the average there is no saying. July averages one-fourth of the whole year's thunderstorms, and in and around London it is a month of heavy rainfall (next to October the heaviest of the year). We may therefore get a double share of rain and thunder in August. From the 6th to the 10th there are usually a good manv rain days, while the period from the nth to the 18th is the finest part of the month. But half of all the rain days have only a very small fall of one-tenth of an inch or less, while only nine per cent, of them have records of half an inch and upwards. August has the same small number of gales as July—89 in 100 years. The first week is one of the two calmest periods of the year, but towards the end of the month the gales increase, and the summer minimum (May to the end of August) comes to a close. The probable course of events may be seen from these figures, which give the percentages of the whole year's gales in the months June to September. June 4*4 per cent., July 5'4 per cent., August 5"6 per cent., September 6'6 per cent. Thunder frequency is one fourth less than in July, but August is, nevertheless, a very thunderous month, having one-fifth of the whole year's storms. It may be noted that while July is the maximum month for England, August has the greatest number of thunder storms in Monmouth and Wales. By the end of the third week (in England), the great thunder frequency abates, and while August has an average of two storms September is credited with only one. Fogs begin to increase about the middle of the month. August has twice as many fogs as July. But they are still very rare, averaging only IA during the whole month, while a dense fog occurs only once in five years. When the temperature falls in September fogs will be multiplied three-fold. Of snow there is none, June, July, August, and September, with most rare exceptions, being entirely free from that visitation in the south of England. Hail is very infrequent, being at its absolute minimum in July and August. There is only one hail-storm in seven years. The mean temperature goes down very slowly, and is almost the same during the first two weeks of August as in the last week of July. By the end of the month there is a fall of 2—3 degrees from the warmest days of July (15th and 16th). But very often we have a rather cold period from the 6th to the nth, and a hot spell from the 12th to the 18th. The following figures show the relative average weather of July and August, and as, in one or two respects, September brings a decided change for the worse, it may be of use to include the figures for that month. The numbers indicate the total of events occurring in a period of ten years :— July. Ten years' gales ... ... ... 9 .» fogs 64 „ dense fogs ... ... 4 „ thunderstorms... ... 274 August. September. 9 Hi 12 37 2 64 21 10 ® ® The Belgian Aviation Circuit. ALTHOUGH the entries for the Belgian National Circuit numbered 18, there were only n of them ready to start from Brussels on Sunday last, and of these only four actually got away from the Berchem flying ground. Vedrines at the last moment wired to say that he would be unable to take part. The quartette of starters were, Lanser on a Deperdussin monoplane, Tyck on a Bleriot monoplane, Prevost also on a Deperdussin, and Parisot on a Farman biplane. The first day's stage was to Mons, with controls at Enghien, Nivelles, Chatelet, and Beaumont, the distance for the day being about 80 miles. Tabuteau, flying a Morane monoplane, was the first to get off the mark, but he was no sooner in the air than the machine fell, although the pilot fortunately escaped without hurt. Parisot was the next, and he rose in fine style at 10 minutes past five, followed by Tyck and Lanser, both of whom started some time after their official time. Tyck was the first to land at Enghien, followed closely by Lanser, and this was the order until the last control was passed in flight, when Lanser was in front. His time for the full distance is given as 2h. 40m. 27s., while Tyck, who was the only other one to complete the course during the day, was placed second, and credited with 3I1. 12m. 41s. Parisot stopped at Fayt, where he had a hair-raising adventure. He was just preparing MANNING. Ten years'hail storms ... ... I4 14 ,, rain-days 124 129 Average rainfall (Greenwich) ... 2*40in. 2-34in. Mean temperature (Greenwich) ... 627 61 "6 Hours of sunshine (Greenwich) ... 208 189 Degree of humidity (Greenwich)... 72-8 76-3 if 123 2'i5in. 57-2 141 80-2 The years. Day. 1 .. 2 .. 3 •• 4 • 5 •• 6 .. 7 •• Table of Weather Phenomena in August. figures show the number of each event in one hundred Z 1 1 2 2 5 1 2 c h 1 2 2 3 7 44 34 C 0 S 1 1 a M 3 v H 7 11 cS 7 8 8 9 « 35 43 46 43 46 57 43 3. § *H 62-I 62-1 62-I 62-2 62-3 62-4 62-5 1st week ... 8 9 10 n 12 13 14 2nd week .. 15 16 17 18 19 20 21 3rd week .. 22 23 24 25 26 27 28 14 4 4 3 4 2 I I 19 4 3 2 2 1 2 5 19 5 4 3 3 1 2 5 23 1 2 2 2 2 3 1 13 2 5 4 8 3 44 2 284 6 6 8 9 3 3 6 4 _ 1 -- - 1 1 3 1 2 1 1 - 1 - 6 1 1 2 2 _ - 1 2 _ -- -- - 1 1 1 - 1 -- - 1 3 1 2 - 2 1 1 1 5« 7 5 9 9 8 6 6 50 7 8 9 4 IO 5 4 47 6 3 5 7 6 2 1 313 54 5' 46 33 37 35 41 297 46 38 40 37 46 48 33 288 37 40 44 48 41 33 44 — 62 5 625 62-5 62-5 62*5 62-4 62-3 — 62-I 62 T> 61-8 61 6 61-4 61-3 6ri — 61-o 6o'9 6o-8 608 60-8 607 6o-6 4th week ... 23 29 3° 31 41 4 7 5 8 33 287 41 32 37 603 6o-i 59*9 ® ® to get away again when a number of children ran in front oi his machine, and it was only by wrecking his biplane that he was able to avoid disaster. Fortunately, he escaped personal injury, as also did the children. Prevost, who started later, got to Enghien, where he decided to stop for the day. On the following day two more completed the course, Crombez getting through on his Sommer monoplane in the elapsed time of nh. 22m. 17s., and Lescarts, on a Farman biplane, whose time was recorded as 12V1. 4m. 47s. During Monday several prizes were competed for at Mons, Lanser winning a race over 10 kiloms., and also another for a 20 kiloms. cross-country flight, in 16m. I3fs. Tyck won the height prize with 750 metres, while Lescarts secured the passenger prize. On Tuesday the competition was resumed, and Lanser and Tyck started off on time for Tournai, the end of the second stage. Three others started later in the day, the number of arrivals at Mons having been increased to six by Contenet, on a Wright, and D'Hespel, on a Deperdussin, both of whom had completed the stage from Brussels to Mons in the early morning. Tyck and Lanser kept in close company until a few kilometres past Grammont, the last control, when Lanser was delayed by a broken propeller. Tyck and D'Hespel completed the stage without mishap. Crombez smashed his machine in starting, and Lescarts decided to postpone his departure as also did Contenet. 695
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