The
photographs shown in the books were taken with this
flash unit which was purchased in the mid-seventies.
This
manual is no longer in print, and Honeywell no longer
produces flash units.
The
following are excerpts only from the Technical
Manual. The manual is approximately 46 pages with diagrams
and troubleshooting instructions.
Copyright
regulations do not permit us to provide the entire document,
however more information from the manual can be provided
upon request to this website (contact info@theprinciplesofreality.com).
In response
to questions regarding the reliability of the flash unit
used in the experiments, and to confirm the duration of
the flash, the unit was sent for testing at BCIT (British
Columbia Institute of Technology). Results of that test
are here.
The Auto/Strobonar
360 has three automatic ranges and is equipped with a mounting
foot which has a hot center contact. It can also be used with
a shutter cord. The 360 is powered by two built-in rechargeable
nickel cadmium cells which comprise the battery. A wall box
containing a rapid charge unit is supplied to recharge the
battery.
On the back of
the Strobonar are mounted an exposure calculator, an Automatic/Manual
selector lever for adjusting the three automatic quench levels
or manual (full light) operation, and the ready light indicator.
The shutter cord
receptacle and charger receptacle are located on the side
of the Strobonar. On the opposite side are located the battery
switch and open flash button.
Two wall
box charger models have been provided for the Auto/Strobonar
360; single voltage and multivoltage. The single voltage charger
accepts 104-129 VAC, 50-60 Hz or 208-258 VAC, 50-6- Hz input.
You must select the proper input voltage by positioning the
switch, located on the bottom of the charger, to the correct
position.
Specifications
a.
Power
Source
Two
A size welded nickel cadmium rechargeable cells.
b.
Battery
Charging
Full
charge -- 3 hours.
c.
Capacitor
Forming
Flash
the unit 5 times at 30 second intervals. After the capacitor
is formed, recycle time will be less than 9 seconds.
d.
Equivalent
Battery Source
2.6
VDC and an impedance of 0.068 ohms.
e.
Guide
Number
Automatic
-- not applicable
Manual -- 42 for ASA 25 film
f.
Automatic
Range
2
to 22 feet.
g.
Flash
Duration
Full
power -- approximately 1/4000 second.
Auto-quench -- vary between 1/4000 and 1/70,000 second.
h.
Recycle
9
seconds maximum with fully charged battery and formed
stroage capacitor.
i.
Flashes
per Charge
5
flashes minimum after a 5 minute charge.
20 flashes minimum after a 20 minute charge.
40 flashes minimum after a 3 hour charge.
j.
Angle
of Illumination
50°
±2° horizontally and 60° ±2° vertically.
k.
Color
Temperature
Approximately
noon daylight.
l.
Full
Power Light Output
44
lumen-seconds per square foot when measured 4 feet from
flash head at the 5th flash. Measurement must be made
with fully charged battery and formed storage capacitor.
Unit must be flashed for measurement after 20 seconds
of power operation.
m.
Auto-Quench
Light Output
With
the ASA set at 25, light output is regulated at three
different levels, depending upon the position of the
Automatic/Manual selector lever. Light output must be
measured at the center of a 4 foot minimum diameter,
18% reflectance, neutral gray target.
ASA
Setting
Auto/Manual
Selector Setting
Automatic
Range (feet)
Nominal
Output (lm-sec/ft2)
25
f/2
4
- 15.5 ft.
3.2
(2.26 - 4.52)
25
f/2.8
3
- 11 ft.
6.4
(4.52 - 9.1)
25
f/4.0
2
- 7.8 ft.
12.8
(9.1 - 18.2)
n.
Shutter
Synchronization
Between
the lens shutters -- x-sync all speeds.
x-sync -- usually 1/60 second.
o.
Battery
Switch/Open Flash Button
2
position sliding switch ON-OFF and pushbutton switch
to open flash or test flash Strobonar.
p.
Auto/Manual
Selector
Automatic
-- selects one of three range indexes.
Manual -- selects manual operation.
q.
Ready
Light
Indicates
when unit has reached 70.7% of rated minimum full power
light output (31.0 lumen-seconds/square feet at 4 feet.
r.
Mount
Standard
universal shoe mount.
s.
Connector
Locking
tip connector or standard PC connector.
t.
Strobonar
Physical Size
3.25"
deep x 1.35" wide x 3.78" high.
u.
Strobonar
Weight
9
ounces
Principles
of Operation
General
Auto/Strobonar
360 provides a source of repeating photoflash light. It is
powered by a built-in, rechargeable nickel cadmium battery.
A two-position switch on the side of the Auto/Strobonar connects
the battery to an oscillator/rectifier circuit. The oscillator/rectifier
circuit converts the low d-c voltage from the battery to high-c
voltage which is stored in a storage capacitor. Closing the
camera shutter contacts or the open flash switch triggers
a xenon flashtube which converts the stored energy into light.
The unit is supplied
with a wall box which contains a rapid charge circuit. The
rapid charge circuit charges the battery from fully discharged
to fully charged in three hours.
The Auto/Strobonar
has a quench circuit which automatically regulates light output.
Using a light-activated, silicon-controlled rectifier (LASCR)
the quench circuit detects and integrates (sums) light reflected
from the subject. When the reflected light reaches a predetermined
level, the flashtube is turned off automatically.
The Automatic/Manual
selector lever on the back of the Strobonar selects either
of three automatic positions or manual position. The lever
positions three different size apertures in front of the light
sensing window of the LASCR, thereby controlling the amount
of light reaching the LASCR during a flash. Each aperture
corresponds to an f/stop to be set on the camera for the film
being used, thus providing a selection of shooting ranges
and depth-of-field control.
Test
results
for the Strobonar 360 used in the
Discontinuity of Motion experiments.
