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 \\ \\\\\\\ù\\\\\`\\ \ u 5 wuentoz @fr Nov. 5, 1946. N. H. JURAN SKETCHING DEVICE Filed oct. 3d, 1944 EAÈ 0,447 3 Sheets-Sheet 5 H. a@ »w w @Hotmail Patented Nov. 5“, 1946 2,4m? 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. ì ì K M y y y _ 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.