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Nov. 5, 1946.
N. H. JURAN ì
'
2,410,447
sKETcHING DEVICE
Filed Oct. 30, 1944
_3 Sheets-Sheet l
Nov. 5, i946.
2,410,447
N. H. JURAN
SKETCI'ÍING DEVICE
Filed oct. so, 1944
5 Sheets-Sheet 2
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Nov. 5, 1946.
N. H. JURAN
SKETCHING DEVICE
Filed oct. 3d, 1944
EAÈ 0,447
3 Sheets-Sheet 5
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Patented Nov. 5“, 1946
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UNET’ED STATES PATENT GFEECE
Nathan> H. Juran; United _States Navy,
Hermosa Beach;v Calif;
Application' October 30, 1944,- >S'eria'l No. 56113143
- s claims.
1
(o1. stt-263)"
(Granted under' the act of March 3, 1883', :isvî
amended April 30, 1928; 370’0. G. 757)
2.
The invention described herein may be manu
facturedfand used' by or' for the Government for
governmental purposes, without payment to me
suchjuas “Lucite” If desired, , standard grid
markings- may be' engraved on- the pane I'I and
scales for various purposesM >may be engraved
of'anyroyalty thereon.
The present invention relates to improvements 5 along the‘edgesof the frame I2; Pins I3'and-I3",
located along the'up'per edge of the" frame I2;`
in sketching devices.` It relatïes'mo’reA particularly
toa sketching‘device for the- production of per
engage with openings in a transparent sheetv Id
to hold the sheet> on the easel I0. The transpar-V
ent‘sheet“ I4 is placed over the pane II of the
easel- in~ position to be dr'avvn> on. >An acetate
spective“ views and 'can beY used in' preparing a
plan'froml a perspective‘vievv andV in producing ay
perspective vieW from a contour map."
I
In order to vobtainV an accurateïperspective'sketch
10 sheet treated to receive pencil markings is sat’
isfactbry.
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M
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_
ofA alsubject‘ such aslthe surrounding terrain,> it
'Ã supporting arn1‘I5jeXt`ends from one side of
has’ previously been necessary‘ to have highly
the frame" I2; The supporting arm I-âfis secured
trained personnel, .who are' not alwaysl available,
make such. sketches.v The present" invention? 15 to a- standard I6l by> a-„univer'salV connection I'I.
The'r universal connection I'l` permitsth'e veasel I0
eliminates the need for' such special skill and
to- beïmoved about the supporting standard i6 to '
training. and can bejuse'd by persons Without spe-y
anyy `desired position. The- universal connection
cial skillto produce' an accurate`> perspective 'view
I'I has two sets" of grooved members I8 and I9
of the desired‘subj'ect; Itis extremely valuable
for military use as it is simple' to use-and is com
pact and readily> transportable.
^
secured` together by a headed shaft 2D and alock
20 ing‘nutf2fl‘;> A l The» groovedfm'embers ‘l Sand I9 have>
clia1'in`els*22"A and '23,' respectively, in their oppos
ing” faces.L vThe'channels 22 and 231m> the re
spective-'setsfof the members IB'and I 9 are placed
Another' object ofV ther present invention-iste
provide a novel device for preparing a perspective
View, such- asL an airplane pilot Would- seeglïof~ a
given locationor 'area from a contour map'.` The
opposite` each'ï other and formy openings-therein,
one of which receives the‘armv I5 and the other
of-*Whichïreceives' the standard I6. The member
device‘isextremely simple and> such a- view may
be prepared quickly> with a- minimumï of equip
ment; Other objects and advan‘tag‘esë of' the
lßgï-adjacentïthe headed endof'thejshaft 2i),` is
keyed»y to the‘shaft 2li> by the pin 24; to hold the
present'inverïtion Will appear from the following
shaftr against *rotationl When the ' lockingv nut 2 I
description' and“ the accompanying drawings in 30 is
tightened.- When the lockingïnutv 2`I4is loose,`
which:
the- universalcormection- I1 maybe moved along>
Fig. 1 isa' plan view ofa sketching device in
theïstand'ardï I6? or'along the arm> I5 as'desired.
corporating. the invention;
Fig.' 2 is a side view of' the’sketching-device
shown in Figi 1;
'
Fig; 3 is'a section view taken- along the'vlin'es
3_3 of Fig. 1;
Fig.` 4 is a section'view taken alongl the lines
A` pinholeïviewingtab 25 is normallyA held iny
spaced relationv with and generally parallel to the
35 easel- I0"i by a‘pair of` supporting arms 23"Which
are secured to the frame I 2.
The viewing tab- 25
ha's-an aperturel~26` approximately’thesize of a
pinhole -which-ïis -preferably`V located on a line per
4_4 of Fig. l; ‘
pendicula-rïto theA center" ofA the easel I0 'when'
Fig. 5 illustrates the use of a sketching-«device 40 thelvie'v'vin‘g' 'tab' is' _in position for use. As'illusà
incorporating the vpresent invention‘in' preparing
tratè'd‘ï'Fig:v 5j, the easel- I0 is located between
a perspective viewof surrounding terrain; ’
the viewing?tab’v 25 and the subject> to be drawn
Fig. 6 illustrates the Ause ofthe-*device in' draw#y
ing a plan or map of an area from a
View of the area;
so‘that‘thelr subject'will be projected by the> eyeV
perspective
.
45
Fig. 7 illustrates `the use‘offthe'device in draw
inga perspective view of a--f-subject from a'co'n'
tour map of the 'Subj-ect; an‘d'
of " an observer” onto'- the' transparent easel` I0;
The'pinhóleîaperture 26 provides a' depth of focus
suñi'ci'én't' for'ïA b'ri'nl'ging'v both# the -' surface of the>
easel I0 and the subject.'vvhich may be' at "Sonie
distance.' into-sharp? focus at the’same' time. This
Fig.' 8 illustrates,-` diagrammaticallyi the ori'-`A
permits rvacci'i'rate - reproduction of ' the'- subject to
entation of the sketching'device for"use"asil1us-’- 50 be made byv merelydravving the subject asseen
tratecl- in Fig.V '7.
on the `easelfï|0á i
y
K
`
Referring tothe drawings'in detail, thereis an `
The vievvin‘g'tab'» 25Tis ` mounted ¿on a _shaft 21
easel Iû'consisting of a pane 'I I o?- transparent ma'
terial surrounded by a metal frameî I2.l The pane
WhicheXt'ei-ìds betvveen" the'en'ds ofthe supporting
I I is preferablyfma’de-of 'a'nonâfrangiblelmaterial ' 55
Wh'enin use,V :by-‘a spring iinger29 on its rearl face
arrasïzaî-¿ßrhewéwm'g tabf 25 is heldin ppsition;
2,410,447
1
3
'which engages with a stop 3D carried between the
ends supporting arms 28.
The supporting arms 2S are secured to a bar
3l which is rotatably held to the frame I2 by
clamps 32 and 33. A stud 34 is threaded through
the bar 3l and strikes the frame l2 when the
supporting arms 28 are raised. The pinhole
aperture 26 may be aligned laterally with the
4
in Fig. 8, a line A is drawn on the map and the
surface upon which it is disposed, said line repre
senting the predetermined direction of approach.
The sketching device is then placed along the
line A and positioned so that an imaginary line
extending between the pinhole aperture 26 and
the center of the easel l0 will lie directly over
the direction line A. The sketching device is
center of the easel when the arms 28 are raised ï -~ located on the line A at the distance D from
by adjustment of the stud 3a. When the aper
ture 26 is properly aligned, the stud 34 is secured
in place by a locking nut 35.
.
which the area is to be viewed. This distance
is measured at the scale of the map from the
Y center of the area to be viewed to a point directly
Y
A clamp 36 is provided at the lower end of the
standard I6 for securing the device to a conven
ient support such as a fence post or the like.
below the pinhole aperture 26.
The e pinhole aperture 26 is then set at the
height H from a selected contour line, measured
at the scale of the map, from which the area
For interior use a stand «lil may be substituted
will be viewed. The sketching instrument is then
for the clamp 36 and the standard i6 will pref-v
adjusted so that the area to be viewed will be
erably be calibrated in units of length.v
c , .
centrally located on the easel Ill when viewed
When the device is not in use, the spring iin
ger 29 is disengaged from the stop 30 and the 20 through the pinhole aperture 26 of the viewing
viewing tab 25 and the supporting arms 28 may _
tab 25. When the above adjustments have been
becollapsed to the positions illustrated by- the
made, the aperture 26 will be in the same rela
tion to the map 39 as a pilot will Vbe to the actual
area when approaching it from the direction and
dotted lines in Fig. 3. When so arranged the de
vice is very compact and takes up a minimum
of space so that it may be readily transported.
The preparation of a perspective of a given
subject is illustrated by Fig. 5. The instrument
is clamped to a suitable support and with the
locking nut 2l on the universal connection l1
height indicated.
When the sketching device has been oriented
in this manner, the selected contour line as
viewed through the viewing tab 25 is traced on
a transparent sheet M which is held on the easel
i6. After the selected contour line has been
loose, the easel I0 andthe viewing tab 25 arev
traced, the height of the sketching device is then
placed so that the desired view of the subjectA
adjusted by an amount equal to the contour in
will «be centered on the easel I6 when viewed
terval of the map and the corresponding contour
throughthe pinhole aperture 2B. The instru- ~
line is traced on the easel IU. In order to make
ment is then ñxed in this position by tightening
the lock-nut> 2|V on the universal connection> I1. 35 it more convenient in adjusting the height of the
sketching device the supporting standard I6 may
The subject as seen on the easel l 8 is then traced
be provided with a scale I6’ calibrated in units of
on the transparent sheet Ill. The resulting draw
length as shown in Figs. 6 and ‘7. This process is
ing will be a true perspective of the subject.
continued until all of the contour lines have been
From a perspective -sketch of flat terrain or
traced on the transparent sheet 4I. T0 com
of terrain that has a constant slope, a true plan
plete the perspective it will only be necessary to
or map may be prepared in the manner illus
connect the edges of the contours with a line d2
trated in Fig. 6. A perspective sketch on a trans
which forms a silhouette of the subject.
parent sheet 3'! is mounted on the easel lll and
Where it is apparent that the reverse or “back
the instrument is adjusted so that the easel will
have the same tip and tilt with respect to a 'Í side” of the contour line will not be visible at the
height and distance from which the area is to be
drawing'board 38 that it had with respect to
viewed, it will not be necessary to draw that por
the subject at the time the original sketch was
tion of the contour line. In such cases the per
made. This tip and tilt may be known or may
spective outline of the area is completed by con
be determined asfor example by aligning three
necting the extremities of the contour lines in
or more points, preferably at the same eleva
the manner previously described.
tion, that have already been located on .the pro
By the method just describedl a perspective of
posed. plan view with the same pointsras pro
a building may be made from the architectural
jected from the perspective view. The perspec
plans. In such a case the successive floor plans
tive should have a focal length corresponding to
will correspond to the contours and the height
the distance between the viewing tab 25 and the
adjustment will be based on the distance between
easel I6.
floors.
When the instrument has been properlyv
While preferred embodiments of the invention
aligned, the projection of the perspective onthe
have been shown and described herein, it will be
drawing board 38 is traced. The projection of
apparent to those skilled in the art that various
the perspective may be made by eye when the
alterations and changes may be made without
‘ perspective is viewed through the pinhole view
departing from the scope of the invention as
ing tab 25. If desired, a source of light approxi
mately the size of a pinpoint maybe placed at
the location of the pinhole aperture 26 in the
viewing tab 25 so that the light rays emanating
from the pinpoint source will project the per
spective. on the drawing board 36. y
_
A perspective view of a given area may be pre
pared from a contour map of` the area in the
manner illustrated in Figs. '7 and 8. The direc
tion, the distance and height from which'the area
is to be viewed are determined in advance.
AV contour map 39 is placed, on a dat surface
and the sketching device is oriented injrelation
thereto. in the following manner. As illustrated
defined _by the appended claims.
I claim:
1. A collapsible sketching device comprising an
easel having a transparent pane, an apertured
viewing tab adjustably mounted on said easel,
said viewing tab adapted to be actuated in a man
'ner such that the viewing tab is brought into
- spaced,v parallel relation with the easel and at the
same time centering said aperture of said viewing
tab with the center of the easel, and means to
support the easel and viewing tab vin a desired
position comprising a supporting standard, a sup
- porting arm attached to the easel, and a universal
2,410,447
connection between the supporting standard and
the supporting arm.
2. A collapsible sketching device comprising an
easel having a transparent pane, an apertured
easel to bring the viewing tab in spaced, parallel
relation with said easel and simultaneously align
the aperture of said viewing tab with the center
of said easel, and means for detachably locking
said support in position for holding the aperture
of said Viewing tab in alignment with the center
of said easel.
5. A collapsible sketching device including an
viewing tab adjustably mounted on said easel,
said viewing tab adapted to be -actuated in a
manner such that the viewing tab is brought into
spaced parallel relation with the easel, means for
detachably holding the viewing tab in spaced,
easel having a transparent pane, a viewing tab
parallel relation with said easel, with the aper 10 support movably mounted on said easel, an aper
ture of said viewing tab centered With the center
tured viewing tab movably mounted on said sup
of said easel and means to support the easel and
port, means for detachably holding said viewing
viewing tab in a desired position comprising a
supporting standard having a scale thereon grad
tab in a iiXed position on said support, said sup
port adapted to be actuated to bring the viewing
uated in units of length, a supporting arm 15 tab in spaced, parallel relation with said easel,
attached to the easel and a universal connection
and means for detachably locking said support in
between the supporting standard and the sup
position for holding said aperture of the viewing
tab in alignment With the center of said easel.
3. A collapsible sketching device including an
6. A collapsible sketching device including an
easel having a transparent pane, a viewing tab 20 easel having a transparent pane, a Viewing tab
support movably mounted on said easel and an
support movably mounted on said easel, an aper
apertured viewing tab mounted on said support,
tured viewing tab movably mounted on said sup
said support adapted to be actuated about said
port, means including a spring ñnger for detach
easel to bring the viewing tab in spaced, parallel
ably holding said viewing tab in a ñXed position
relation with said easel and simultaneously align
on said support, said support adapted to be actu
the aperture of said viewing tab with the center
ated to bring the viewing tab in spaced, parallel
of said easel.
relation with said easel, and means including
4. A collapsible sketching device including an
clamps for detachably locking said support in
easel having a transparent pane, a viewing tab
position for holding said aperture of the Viewing
support movably mounted on said easel and an 30 tab in alignment with the center of said easel.
apertured viewing tab 'mounted on said support,
said support adapted to be actuated about said
porting arm.
NATHAN H. JURAN.
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