July-August - Air Defense Artillery School

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1 foot per second \\'ould be (d% H factor)~. To deter- 100 mine the difference in muzzle velocity between the assumed and the deyeloped muzzle yelocity it is only necessary to determine the horizontal range de\'iation TO of the burst, then add to this the horizontal range effect OP of the vertical de\'iation, and diyide the resultant length TP by (d% H Rl factor) 100 . Then 6.i\ IV = length of line TP (d%H factor) Rl 100 Referring to figure 2 which is a horizontal projection of the problem. The horizontal range deviation due to a lateral deyiation from the batten' and Rank is TO. CD = ER. but TD = TC + CD = ::t 0202 l' 1000 sin =+= l')} 01 ----- 1000 tan T = :J 02 H 1000 sin £2sin T 01 H + ------~ 1000 sin £1tan T The horizontal range deviation due to a vertical deviation from the battery is DP. Referring to figure 1: 01(11sin £1 (11H D P = ::t 1000 ~~::t 1000 Then TP = TD + DP ancl 6.i\IV = (11H t'h H :!: 1000 :!: 1000 sin £1 tan T By the process of factoring. 61\IV = ::tC1(11::tC281 """C3()2 where, H CI = lORI (d%J-) factor) C1 C2 = sin £1 tan T C1 C3= .. T SIn £2 SIn (d%H factor~ RI 100 The sign to be used with these factors is given above. To I simplify the computations, the yalues of Cl for the 90mm ancl 3 inch AA guns are given in Tables I and II. ~ The vertical correction required to move the bursts onto the muzzle velocity line is equal to minus (11corrected b\ the vertical angle from 01 which is sub tended by the length 1\IK. This correction is equal to 6MV multiplied by the d.p factor gi\'en in the graphical firing tables. Then 4 d = (11+ 6.MV (cI factor) j The lateral correction is equal to the minus ()1 converted to the horizontal plane. 1 -01 orelA = --- .. cos £1 .. 02 H 1000 sin £2 sin f
'Protective Cover • The cover expanded. . 1. Still shooting, with , or without mustard. ~ Shaking out the cover. The euer-alert Chemical Warfare Seruice has designed a handy little gadget to protect American soldiers from the effects of uesicant gases . .1. 1943's soldier gets better pro- , tection than his father did.
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Page 59 and 60: 1';J-fj COAST ARTILLERY BOARD A'OTE
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Page 63 and 64: Group Subscription Orders 1he 198th
Page 65 and 66: 1943 :\'EWS AND CO~l~lE0JT 63 "zero
Page 67 and 68: British AA Battery Arrives \ specia
Page 69 and 70: COAST ARTILLERY ACTI\'ITIES (V peac
Page 71 and 72: CUAsT ARIILLERY ACTl\'ITIES riot ra
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Page 77 and 78: Camp Wallace COLONEL HAHOLD H. IACK
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Page 87 and 88: J43 BOOK REVIEWS Fof the unvarnishe
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Page 93 and 94: No Phoney W'ae LDCATS OVER CASABLAN
Page 95 and 96: \X'ar Fiction £ FIGHTING AMERICAN.
Page 97 and 98: ------- BOOK REVIE\VS 95 U \'ou wan
Page 99 and 100: Again Available! oast ~rtillery RIN
Page 102 and 103:
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July-August - Air Defense Artillery School

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