January-February - Air Defense Artillery

LT. COL. JAl\lES T. BARBER
LT. COL. ANDREW \V. CLEl\lENT
LT. COL. \VILLIAI\I H.. 1\IIURRIN
LT. COL. GEORGE B. \VEBSTER, JR.
COLONEL R. E. DINGEMAN, President
TEST SECTION
y illdil'idual, whether or lIot he is a member of the sen7ice, is illvited to submit COllstmctive suggestions relating to
oblems ullder study by the Seacoast Service Test Section, Army Groulld Forces Board No.1, or to present an)' new
Dblem that may properly be cOllsidered by the Section. Commllllicatiolls should be addressed to tile President, Seast
Sen'ice Test Sectioll, Arm)' Ground Forces Board No. I, Fort MOllroe, Virginia.
s IJertaillillg to Alltiaircraft Artillery should be sent to the Alltiaircraft Test Sectioll, Arm)' Groulld Forces Board
. 1. Fort Bliss, Texas.
Cas Gellerators MX-.J2.J IG. Gas Generators 1\IX-424/G
d ~ tX424A/G, have been tested recenth, to determine
cir suitability as substitute fuel generator; in remote 10lilies.
These two units are transportable charcoal gas
ucers which generate carbon monoxide gas. Tested
ith Power Units PE-197 and PE-75-C, it was determined
at the two gas generators were not satisfactory because of
e lo\\' percentage of rated power output obtainable from
e power units. However, the tests indicated that the local
oduction of charcoal is feasible and that, with a more
lcient type of substitute fuel generator, operation of
Iler units in localities difficult to supply with gasoline
el wiJI be practicablc. Consequently, it has been recomended
that a more efficient type of substitute fuel generar
be dcvclopcd.
Velltilation of Trailer \1-9IM PC-I. Facilities for the
ntihltion of the Trailer V-9/J\IPG-I, in which the Radar
t A:'\ /1\ 1PG-I is operated, have been found by test to he
IOlldequate. \Vhen outside temperatures reached 90 0 F.
more, tcmperatures as high as 118 0 were measured in
operators' space in the trailer. \Vhen these high tematures
were accompanied by high relative humidity,
rator efficiency was reduced greatly and operators could
k onlv a few minutes without relief.
As the' result of action initiated by this Section. developllent
work was undertaken by the Signal Corps, and a submial
improvement in the ,.entilating facilities of one of
trailers was effected. 1\loc1ifications incorporated in
model included removal of obstructions in the air ine
ports and the instaJIation of louvers in the front door.
is understood that development work to provide satisfacy
rentilation in the trailer will be completed, and that a
.el trailer incorporating the improvements will be made
ilable .. for service test. It is likely that air conditioninQ ~
Ipment suitable for application to the trailer will be
at the same time.
111m Subcaliber CUll T4E1 for 16-incll Gun Mk II.
Section has recently completed tests on Subcaliber
MAJOR AUSTIN E. FRIBANCE
MAJOR DALE \V. OLSEN
CaPTAIN FOSTER A. HINSHAW, S.c.
C.-\PTAIN C. W. ZIEGLER, 0.0.
Gun T4EI for 16-inch Guns Mk II and 1\lk II. 1\100. 1.
The subject gun is an internaJIy mounted subcaliber gun
having ballistic characteristics similar to those of the 75mm
Gun 1\111916. j'l'I 1917, and 1\12. The standard ammunition,
identical to that used with the 75mm Subcaliber Guns
1\17, 1\18, and 1\19, is fixed and consists of Shell, Inert,
1\148, equipped with a propeJIing charge giving 1,470 fIs
muzzle velocity eFT 75-AF-I). The standard firing circuit
and firing mechanism of the 16-inch gun are used with
the 75mm ammunition which incorporates an ignition type
primer. The Section recommended that with minor modifications
the T 4E I be standardized and issued on the basis
of one per parent gun. In addition, it was recommended
that a power extractor and a combination wrench of suggested
design, together with certain additional tools and
accessories be furnished.
Hexagollalhead screw for Telescope MOl/nt M43. The
Section has recommended that a hexagonal head screw be
adopted to replace slotted Screw A46233, used on Telescope
Mount M43 to tighten Panoramic Telescope 1\18.
The hexagonal head improves the leverage and permits the
screws to be tightened sufficiently with standard tools to
reduce the possibility of movement of the sight in the
mount during firing. \Vith the present slotted Screw
A46233 a special offset screwdriver is necessary which
gives insufficient leverage for tightening the screws.
FI/ze setter bracket for 90mm GUll MOl/llt 1"13. Tests
were recently completed on a Fuze Setter Bracket Cn0714 7
for the 90mm Gun 1\llount 1\-13 which mounts the fuze
setter nine inches forward of its present position. The
experimental brackets were installed on the gun mounts
of Battery E, Harbor Defenses of Chesapeake Bay, and
used during training and two antiaircraft target practices.
The relocation materially improved the ammunition handling
and reduced the interference between the gun house
and the round being insened in the fuze setter. It was
recommended that the Fuze Setter Bracket Cn07147 be
adopted to replace the present standard Bracket D4995:i.