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CHAI{ARD II{CBNDIARY BOMB

SERVICE HANDBOOK

PREPARED IN THE OFFICE OFTHE CHIEF OF ORDNANCE

December, 19f9

AROI"{IVTS I-IBRARYT}XE NITIOI'IAL

WASHINGTON

GOVERNMENT PRINTING OFFICE1920

W.ln DpBerruurrr.. Document No. 991.

Ofrce of The Ailtutont efunnral.

,/WAB DEPABTMENT,'Wrs TcroN, Decernber 79, 7979.

The following publication, entitled 66 Chanard Incendiary Bomb,D

is published, for the infomation and guidance of all concorned,.[062.1, A. C. O.I

Br ononn oF TsE Sncnnmnv or 'WEn:

F'RAITK MoINTffiE'Major General,, General' Staf ,

Actdng Chief of Btof.Omrcr.rr,:

P, C. HARRTS,ffu Adiutamt General.

156858-20ia.1-

TABLE OF' CONTENTS.

Page.E

The bomb 'The fuse- 'OperationMarking and packing------- 8

Preparation for use------- 8

plate I--------- - (To face page 8.)

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CIIANARD INCENDIARY BOMB.

THE BOMB.

The Chanard incendiary bomb is intend"ed for use against mat6rielsuch as buildings (especially temporary buildings), grain fields,ammunition dumps, or anything of an inflammable nature.

The over-all length of the bomb is 28.4 inches and the maximum.diameter 4.?2 inches. The weight of the loaded bomb is 22 pounds.

This bomb consists of a thin case containing an incendiary mixtureA (see plate), of nitrated cellulose, turpentine, resin, celluloid, etc.fn the tail of the bomb is a quiclr rrratclr. B, which is ignited by thefuse and which in turn ignites a charge of powder, the incendiarymaterial described above, ancl also a thermit mixture C, contained. intubes which run along opposite sides of the bomb and through thocenter at right angles to the axis of the bomb.

THE FUSE.

The fuse used in bhis bomb is a special tail fuse in which a strongspring.H tends to drive the firing pin ,/ against the primer L. Themotion of the firing pin ,/ is, however, prevented by four steel ballsG, which rest in openings in the hollow firing pin ,I, between thearming vane spindle E and, a shoulder on the inside of the fusebody .K. .'When the bomb has fallen about 250 feet from the air-plane the arrring vane l7 has screwed the arming vane spindle ^4out so far that it no longer retains the balls G in position and. theyfall inside the hollow firing pin ./, permitting the latter to fly for-ward und.er the impulse of the spring E and strike the primer Z.

A Gros-Andreau nose support is provided for carrying the bombvertically in the French 120-mm. cells. This supporb provides ameans of suspension onlv and does not affect the operation of thebomb.' The key P should be removed after loading the bombs ontothe release mechanism.

OPERATION.

'When the bomb is released. from the airplane and the fuse hasfunctioned as described above, the primer L ignites a delay fusewhich. burns for 5 seconds, at the end of whic.h time it ignites apowder charge surrounding the ends of the quick-match B; this in

8 CTTANARD INCENDIARY BOMB.

turn ignites the thermit in tubes C, which, as it burns, melts the tubingand ignites the incendiary charge .4. The nose and tailpieces, com-bined with the air pressure on the falling bomb, hold the bomb togetheruntil it strikes the objective, when it falls apart, liberating a fiercelyburning urass which continues burning for about 15 minutes.

MARKING AND PACKING.

The Chanard bomb is painted red and is marked C. D. 120, withthe.date of loading, anc'l the number of the lot. The bomb can alsobe distinguished by , circle surrounded by a white ring near thecenter of the bomb. They are packecl two in a wooden box.

PREPARATION FOR USE.

1. Load the bomb on the release rnechanism.2. Screw the fuse into the bomb.B. Cut the two iron wires holding the arming vane.4. Ifnscrew the arming vane 3 or 4 turns.Impartamf.-The fuse functions by unscrewing the arming vane 1

inch of the threadecl part. Therefore-1. I{ever unscrew the vane more than 3 or 4 turns to loosen it.2. Re sure, in the carriers, that the arming yane is securely stopped.

Nors.-To carry this bomb in the release mechanism Mark V, it is necessaryto provide the arming-vane stop as describecl in the addenda to the Elanclbookon Release Mechanism, I\{arir V, War Depertment Document No. 898 (ad-dend.um to).

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