by precipitating the fog by means of en electrostatic field onto a con~tinuously moving, specially sensitized film. Film reels were later
removed from
precipitator
sampling for
signal from
the device, developed, and analyzed, The electrostatic
vas powered by a 1 KVA motor generator and was capable of
a maximum of 6 hr. At island stetions it was started by a
a light trigger and manually on the YAG's,
The uutomatic water drop collector was a device for collecting
raindrops in flour filled trays when they were retained as pellets of
dough. After a pre-determined numper of rain drops had been collected,
the device automatically changed trays. The collector was started by a
signal from a light trigger. The mechanism for changing trays was
driven by compressed gas and was criggered by arain drop contacting a
sensitive element. The area of the sensitive element was adjusted so
that there was a high probubility that a tray would be changed only after
a pre-determined number of drops had fallen into it.
3.1.6
Triggers
The corincipal trigger was a light-activated device consisting of
‘ peteges yheady a trigger box, and a battery and pover cable assembly
Fig. 303)
ger.
.
A prototype radicticn trigger was also tested as a back-up trigIts sensitivity was so high thet it could not be used on the ccn-
tuminated islands efter Shot 1.
It may prove to be satisfactcry after
some modifications.
Simple pressure-ectuated trigsers were designed and ccnstructed
at the site to elleviute the shortage of triggers that occurred when
eparesc vere burned cfter shot 1.
3.1.7
»
Free-flosting Buoys
Free-floating buoys vere used as collection stations in the sea
areas around Sikini atoll. Figure 3.4 shows the following details of
construction: Flatform to mount the gummed paper collector; antenna
whips; antenne coils; identification flag; total collector; buoy float
contsining the radio transmitter and bettery nower; and keel mount. Not
shown are the weight «t the bottom of keel rount and the film badge on
the mast 2 ft above deck,
The identifiers on the floats were single-stuge crystal-controlled
radio transmitters, operating on the following autnorized frequencies*
1309.375, 1243.75, 1206.25, 1159.375, 1129.375, 1087.5, 1062.5, 1026.875,
987.5, and 741,875 ke. These units had a useful life of 4 to 6 days
before the batteries had to be re-charged. The buoys were identified end
located by radio cir_ction-finding gear avoard Naval Task Uroup chips and
aircraft.
3.2
EVALUATION CF STATIONS AND EQUIPMENT
It is difficult to mike a fair evalustion of the station and equipment at CASTLE because numerous chanses in shot scheduling and the
* Circuit Wo. J113, assigned ty letter from Headquarters, TG 7.1, JIF-7,
J-22227, 15 Dec. 1953,
39