. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . In the Clift compass an adjustable pointer is provided, which isattached to the card and can be rotated to any required pointer is set to the course required, aiid all that is thennecessary is to keep it opposite the lubber line. The same attach-ment can be illuminated so that a white light shows when thecourse is correct, a red light when the machine is otF the course tothe left, and a green light Mhen oft to the right;
. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . In the Clift compass an adjustable pointer is provided, which isattached to the card and can be rotated to any required pointer is set to the course required, aiid all that is thennecessary is to keep it opposite the lubber line. The same attach-ment can be illuminated so that a white light shows when thecourse is correct, a red light when the machine is otF the course tothe left, and a green light Mhen oft to the right; it also allows thecard to be lifted off its pivot m hen not in use, thus preventing unduewear of the centres. It has been suggested that luminous paintshould be used to facilitate steering at night. An allowance for leeway due to side winds must be made ;experience with the same machine in different winds will enablethe pilot to judge the leeway he is making with a considerabledegree of accuracy, by noting the apparent direction of travel ofthe ground. Probably some simple instrument will be devised toestimate the leeway by observation of this ^ of the Compass. iS Z r.^ ~t -+ * ~ re — -t ?c -- ^ 1 ^ .E — r. r^ vr ,- 7- .^j — v ,, .- ,- -^ /v, _ /z ^ -r r: M ~ t -•■ * i~ -f i/i a! — o y be & = M I--: X — -t -0 - ?! ,-. x — j«. •^ ^ M j< — — c-l M ^ c^ TC ?i -t ^ 1 ■^ -++ -;ti :: — -J— -:i ■: — --r _ ;, --_ -i-r _-, ■-_ ■5 — — — — — Tl ^i i\ fO rc 7: r & ■ • . / X X ;::: ■^ - -n -- r i -^ -^ — w— -sn • >. >. i—■ .-* •^ ^ 1 — — — X X X X X i::: - 1^ ::: ^ X X X X X X X X X X X X X X X ■ X ■ ■ X ■ IJii — -,-T ■ -- X X ^ ^ - _-, X X X X X ji -iT ^ ^ ^ >. ::• _^-- -tr\ — , i —-1 -• >. >. ll. liz -^ — i^ - - . ^ „ -^ — — X X X X X jl; -:- jl: ^ :£: X X X X X X X GO X X X X X X yl X • ■ >: >• y
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
