Ernemann-Synchronismus, Ausführung I

THE IRON STAND.
This as will be seen consists of a solidly constructed table on four
legs, two of which are provided with levelling screws ; on the table top
is found a cloth-covered wooden baseboard for the Microscope with a
screw-down clamp to hold it steady : a Microscope with a horse-shoe
foot is desirable. A tripod occupies one end of the stand with two of
its legs perfectly vertical, these serve to carry a travelling iron plate to
which the Camera is attached by screws in the ordinary way. One side
of the Camera-Plate revolves on ihe upright, and is fitted with a
clamping screw, while a clamping lever attaches the other side of the
plate to the other upright, when this lever is released the Camera can
be swung out to one side so that ocular Observation of the object to be
photographed may be made, thus illuminator, light, and objectives may
be accurately centred just as is always done for critical Observation.
To the other end of the stand is fixed the optical bench.
THE CAMERA.
This points downwards directly over the Microscope, a condition
of affairs that might strike one, on first consideration, as being objectionable.
In practice, however, this arrangement will be found to be most
convenient, and is likely to be universally adopted for this class of work.
This is ERNEMANN'S usual Kinematographie Camera, Model
"A," which, with the addition of an ordinary Photographic Lens, can be
removed from the micro apparatus, and used for ordinary Kinematography,
or on the apparatus for low power work, such as insects,
caterpillars, etc., etc.
For Micro - cinematograph work the ordinary Camera lens is
removed, and the small quadrangular bellows attached to the lens board
is extended between the Camera and the Microscope for making a
light-tight connection.
A dial is fitted showing exactly how many yards of film have been
used. When the film has been used up, the lower film box, which
then contains the film, can be.removed, and the upper film box slipped
into the place of it, a filled film box taking its place above. The
handle is detachable, and when a picture is being taken by band it is
fitted to the lower spindle. By means of a simple contrivance the
Camera can also be used for PRINTING, in which case the handle is
fitted to the upper spindle, and so a slower motion is obtained, the
positive film being run from box to box as when taking, while the
negative film passes from a spool on the top of the Camera through a
slot, then in front of the positive film and out of the front at the bottom.
When the Motor is being used the handle is entirely removed.
The Camera is made of mahogany, covered with the best leather,
and is but little larger than an ordinary magazine camera.
The Camera as supplied with this outfit is fitted with a means
of direct Observation of the object all the time it is being
photographed.
In place of the usual lens, a quadrangular bellows several inches
long is attached to the lens board, this is for making a light-tight
connection between the Camera and Microscope. At the back of the
lens board is a prismatic arrangement of optical glass through which the
image is projected on to the film. The glass reflects the image from
the face of the film, and it can be carefully and exactly watched by
the Operator through the magnifying loup tube which projects from the
side of the Camera.
Although direct Observation is obtained through the magnifying
loup tube projecting from one side of the Camera, it is but a moment's
work to slip the expanding bellows off the Microscope and swing the
Camera clear for direct Observation through the Microscope itself. In
this way critical Observation can be made direct at the Microscope, and
with the minimum of time the Camera can be thrown into line, extension
bellows fitted, and photograph taken, and the Observation, during the
whole Photographie period, continued through the magnifying loup tube
of the Camera.
THE OPTICAL BENCH
is a carefully planed up and trued iron girder, which carries riders
to which are attached the various Attings, namely : the illuminant,
condensers, light-filters, etc. ; these riders have clamping screws and
are all accurately centred, with means of using oblique illumination if
necessary. With the outfit, is included an Are Lamp having all movements
by rackwork, for swinging, tilting, advancing top carbon alone,
feeding both carbons simultaneously, etc., etc. The lamp is supplied
complete with resistance for one or two hundred volts, three ampere,
so that current can be taken from an ordinary house lamp socket.
Next, is a 60mm. diameter condenser, an adaption of the Herschel
type, consisting of a combination of a meniscus and piano convex lens,
and which in practice gives a most even field of illumination, almost
entirely free from spherical aberration, a point of the very greatest
importance in the lighting of micro slides or speeimens.
Between the light and the swivel minor at the base of the
Microscope, is a liquid light filter and heat absorber, which appears to
- 5 -