US845043A

US845043A - Protractor.

Info

Publication number: US845043A
Application number: US33754706A
Authority: US
Inventors: Abraham Anderson
Original assignee: Individual
Current assignee: Individual
Priority date: 1906-10-05
Filing date: 1906-10-05
Publication date: 1907-02-26
Anticipated expiration: 1924-02-26

Description

lATENTED FEB. 26, 1967.

A. ANDERSON.

PROTRAUTOR.

APPLIOATION FILED 0012.5, 190e.

gro. 8415.943.

2 SHEETS-SHEET 1.

BAHN

TBL FEB, ze, 1907,

A. ANDERSON. PROTRAGTOR.

APPLIGATION FILED 0017.5, moe.

2 SHEETS-SHEET $1 l s offenes;

ABRAHAM. ANDERSON,

PATENT (3F-FICE..

.0E -1MoLINE, ILLINOIS;

Nes-15,043.

f,- Specifcation of Letters Patent. Application filed October 5.1906. 'Serial No.- 337.547.

. Patented Feb. 2e, 190'?.

YTo 1/Zt ma'yvconcern: A-

Be' i t vknon'rntha I, ABRAHAM ANDERSON a citizenfofthe UnitedStates, and 'a resident usefullm sorrlihpltjr.- e" 1n' vent1on relates to an Improved 1n- ,f fmikfefrpetea @11d the like. for laying out "work-J )Such an'instrument'is -shownf in i x5 Letters Patent 4of the' 'United States .No.

802,614', issuedito me september 25, l1905.

The present`v invention seeks to improvel aridi-simplifie@ wnstflon .and fel-der it better. ,applicable 'fort'he .Werk to .be Per" zo forr'itred..1 Y

. -Theginention consists in the featuresof` ments .of'parts hereinafter set forth,'illus' 4a The up er surface of the base-plate isk also prefera 1y' flat', as shown, .and a suitable support or upright standard' 11 is mounted n pon the base-pls le to rotate about-a vertical axis.

This su' port or upright standard isprovided 45 in thej orm shown at its lower end with a horizontal'ilange 12, that is somewhat greater "than fa. semicu'cle. 'Below the vlia-nge the support or standard is provided with a deending pivot or journal portion 13, which 5o its snugly within a circular op enrng`14 1n the base-plate. 3 A circular clam dlsk or plate 15 is set in the under side of t e base-plate 10 and tits snugly Within a circular recess or o. ening 16, which is concentric with bui A l 55 s ightly larger than the o ening 14. A

clamp-bolt' 17 extends throug theplate 15,

f Rock Island', and State. A v 'entedcertainjnew and- .lprjore entsi'if Profrasfrsyofwh'chl the foil a\fi'1ll clear, fandf'exaot delarti'oularly pointed vout in the ap- Figs, 3,' Land 5 'are detail sec- 3 3,4 '4, and 55,' res eci. 6 is an end v'iewo the' the flan'fre 12 at thelower end of the support or stanardll 1, anda, flange '18fat the' upper end of the support orst'andard. A thumbnut- 19' is .threaded on. the .upper end'lof the bolt', and the bolt and I naybe used `to Vsecurely clarnp `the `support orl standard and disk -15 uponthie base-'plate 1 '01- 'I hegclarnp late or diskiS-'is .preferably eerste-fthease-plateg'softhat' the lowerff'rceof-.these parts are inthe sameplane, and; theheadfof the elarnv -holt 17 is countersunk in .the clamp-dis V'15, so' that the instrument. may be held firmly in place" upna table, bench, or'other flat surface. By loosening'- the'nut 19' the support. or standard' '1-1 and'cla'r'np- -disk rISmay-be' rotated about a w'fert'iea'iairis, extendingthrough the center of the circular openings 14 and 1 5.'l Bytighteningthe nut the `parts are securely heldin adju'stedf posilaterally-extending: `flanges 20, the` faces 'of' .15 v non'. '-The'standard or support'1'1/1s1-prowhich are nicely finished and arranged in a Avertical ilane'. The base-flange 12 at 'the' lower' en of the support or standard terminates .in a straight lin'e at the lower'` edge of the. flange portions 20, andthe clamp-s'crew'v 1 7 is arranged midway betweenthsgfacerand plaise Without .tending to"A tip'-v it.-.in.QL'' .r-,tlie other direction.

'A'semicircular portion fof.' the base-,plate is provided 'with ai' scale 21,Y.indicatiuganglesor upon which' the-support -or standard-11i rotates. The' base-flange 12 .fof' the'.4 support-,o1-

stand ard is providedw'ith ap o'int'ert22, which coperates with the scale`21 tindicate the' "angle between the Hat Vertical"i"ace' of the support `or standard 11 and a line or' 'plane through the zero-point of the scale and the vertical axis 'about which the support' or standard revolves. The" baselate is provided at one side with extend'e portions 23,

degrees andstr'lcki from theyertikial axis having -a straight edge or face 24- parallell to piet-.es of work, -the lface'of the support or IIO standard 1 1 is recessed orv slotted to forma vertical guidewa'y or groove 27, lj-,shapedin cross-section, Within which slides a corre-v spondingly-shaped block 28. A'clampesjcrewi 29threaded intofthe'upper portion offthe block 28, 1s provided with a thumb-piece 30 and a flange 31, adapted to engage tne outer edges ofthe guide-groove A271:3 securely clamp the vertically-sliding 'block 28 "in ad# justed position upon the support or standard 11. A laterally-projecting cylindrical stud 32 is journaled -in the-lower portion of the block 28 to rotate on a horizontal axis. y The stud is rovided on its inner end with a head 33, an its outer portion'is provided with a longitudinal slot 34, through. which extends thexnarkingbiade 26. The outer end of the slot on the underside vof the stud 32 is opened to permit'the readyirisertion of the lmarkingblade. I The thin Iiat marking-blade is thus.

carriedby thelsupport orl standard in hori- 'zontalfposition,` but may be adjusted --vert'i cally .tlire'on with the block.28 an'd'stud'32.

. .Theblade may also .b erotated about 'the axis of thestud 32 and is shi'tablelongitudinally through the slot 34 o.-the stud. A shoe 35,

4'carried by the stud,is arranged to engage the outer edgelof themarking-blade, and a clampbolt 36,.,extending transverselyl throughtue outer end o'f the 'stud 32;'isxprovided with'a beveled head'engaging the shoe 35 and with an adjusting thumb-nut 37, engagingl the outer side of: the stud.' By tightening the lnut 37 the 'shoe- 35v and markingblade 36 are lss forcedlinwardly in the slot34'of. the stud until the blade is clamped firmly in position lagainst the vertical face ofthe support or up# right standard 11. This also serves to hold the stud32'against rotation. Y

The instrument is particularly valuable Jfor laying out lines upon pieces of work the edges of which are curved, and tov properly position the instrument withv reference to 'such a piece `of work the base visprovided with a pairhof laterally-extending gave-arms 38, the ends of which-arel provided with vertically-disposed cylindrical bearing; ortions 39, that are.l adapted to ab'ut; agamstj the curved edge 'ofthe work. These gage-arms are mounted to slideuponl a horizontal guide 40, that is preferably recta' ular in -section and formed upon orbraze 4totheside of the base-plate 38 rest upon their upper faces.

10 op osite the strai ht-edge 25. The bottorn ace of the'ui e 'is preferably in :the same plane with e bottom face of the base plate 10, andits guiding-'faces are parallel .leftl hand screw 47. `the ends vof the screw, are provided with flanges 49, which abut against vthe ends ofthe may be ad] holes 1n the upper race ofthe slide-41 to hold 7'o the gage-armA 38 at right angles to the guide 40 `or at an angle or forty-five degrees thereto in one or the other direction.

v rI he guide 40 is provided with a-cylindrical bore 46, within which is journaled a right and 7 5 Nuis 48, threaded on' guide 40, andvwith-circular bosses 50, (seeY rigs. 1 and 5,) which' lit snugly within the 8o ends of the bore 46 of the guide. Nuts 48 are provided with flattened faces 51 tore-` ceive a suitable wrench or other tool for acl-- justing them on the screw 47. Y'lhese nuts.

are adjusted in positionlwith their flanges-85 snugly engaging theends of the guide to takeup the lose modon between the paris, and the*h nuLs 48 are held'securely in adjusted position by the locknus 52. These' .lock-nuits are provided with knurled fianges form-,ing ing'er- 9o.

pieces by which the screw 47 maybe rotated.'

l'he heads53'of a pair of eyeboli's 54 are'ar-. ranged within the bore 46 or' the guide 40 andare threaded'upon theopposite endsof the right and left hand screw 47. The 'bolts53 '95` extend upwardly through .a longitudinal slot 5,5 in the upper portion ofthe guide 40 through central openings in the'slides 41 andi heads42 of the gage-ams 38, so as to connect the slides and gage-arms with the screw. 1 o: Thumb-huis 56 upon the upper ends ofthe eyebolis 54 serve to clamp the gage-arms upontheslides 41 and also serve to clamp the slides 41 and gage-'arms in adjusted posi- -tion upon the guide 40. By loosening the m5 f thumb-nuls 56 screw '47 may be rotated in either ldirectionjto Vsimultaneously move the gage-arms 38 outwardly :or- 4inwardly to spread or contract the saine; By tightening.

the'thumb-screws 56 the vguide-arms are se- 11o A curely held in adjusted position and all lost motion is taken up between the adjustingscrew and the gage-arms. The heads-530i the eyebol'ts are, however, arrangedto abut against the upper portion of the bore 46 of rr 5 the slot 50, so that it is impossible to place' undue strain .upon the adJuSLing-screw 47 by turning the thumbnuis 56.

Each of the cylind 'cal bearing ends39 of the gage-arms is provided at its upper por- 12o tion, with alaerally-ofl'set piece 57, vthat isheldin place By a thumb-screw 58. Thumb screw 58 is provided lwith a flanged head 59 and extends loosely through one end f the piece 57 and is threaded into the bore of the.: 2

earing end portionl39. Piece57 is eccen-` trically pivo;ed o n theclamp-screw 58 and 'usfed-, atf any desired angle and clamped in adjused iosiri'on.

At one end the bla *fe 26 is provided-'With a 130. y ,L

'nel

. j movably and slidably mounted thereon. A

posi-te sidesof this'planew'lien the pointer.-

A.is

conical marking-roller 60, having a sharened edge Varranged in line'with the'inn'er e geef the blade` The roller is journaled -upona stud-bolt 61, fixed to a supporting memberA 62. This supporting member ispartially split, as indicated in Fig. 1, and the split sections extend lWithin a slot 63 (see Fig. 6) in the end of the blade; A screw 64, having'a conical head, is -arranged'to spread the sec- .t-ions of the supporting, member .62 and iirmly, clamp it, together .with a roller 60,'

upon the end of theimarking-blade. `The 'blade is also provided with a T-liead or' )straight-edge 65, which is suitably slot-ted on l its under face to engage the blade and is reclainp-screw 66 is.. provided Wit-ha `conical head 67,V arranged to engage one edge of the blade, and a thumb-nut 68 on the upper end of the screw 66 is adaptedto force the'conical head 67 against the edge of the blade `26 and securely'clamp the straight-edge 65 thereon.

It should benoted that the edge .of the marking-blade and the face of the supportl or standard 1'1 ,against Whichthe blade is held, are arranged in a vertical plane and the gagearms SS'arearrangedfat equal distance on o p- 22 is at 90 on the scale, so that by holdingy the instrument. in position withthe gage` arms abutting against aroundedor cylindrical piece .of' work radiallines or lines'at any desirous angle to the radius may be drawn thereon by properly positioning the ro. a` able d siLilpport ors` andard 1.1' uponthe'base plate 10..

parts ofthe instrument lare above the lower Hat face of the base-plaie, so that it can be placediirmly iipon a table', bench, or

other at surface and placed in position against the Work, as indica', ed in Fig. 2.'- The instrument may also be held in the hand and placed against the edgeof the work, and.

I in such cases the. ieces 57 onthe'cylindrical bea'ring ends 39o the gage-ams serve to engage the upper face of the 4Work and firmly 'hold the instrument in position.

The marking-blade is rotatably adjustable in ya hon'zoiita plane about a yertica'l axis -with the supporter standard 11 and in a vertic-al plane upon' a lioi'izontalaxis withthe stud l33. The :blade may be also raised and. lowered with the block 29 to bring it in proper 'relation with the surface ofthe Work. and may be shifted longitudinally through theillustrated. By adjusting'the gage-arms 38,3

conveniently uscdtor. laying' out lines upon the face of a ge r-wbeel, as" indicated in Fig. 9, or for laying/out lines upon asemicircular surface, as indicated in Fig. 7. The instrument is capable of many other uses and may upon theslides 41 the instrument may be be employed with" great advantage by ma.

When the chinists -and pattern-makers.

.edge of the Work. is straight, the straight-edge 125 may of course be conveniently employed for positioning the instrument.

It'isl obviousv that numerous changes may bemade in the details of structure without depaiture from the essentials of the invention.-

lHaving. described my invention, whatv I l cl aim as new, and vdesire to secureby LettersA Patent, is`-.

.1. A protactor comprising a base,`a'sup. port rotatably mounted on said-base, a laterall y-extending marking-blade carried by said support, said rotatable support and said base having acoperating pointer andscale tedetermine the adjustment of said support',

forming a straight-edge, a air'of ga mounted on said/base an gage the .rounded `edges of thework andnieans for adjusting saidarms to spread and contract the same, substantially'as described.

2. A'prctliactor comprising a -basefa support rotatably mounted on said base, a laterally-extending marking-blade carriedv by said. support, said rotatable support and saidbase having a coperating'pointer and scale to de.-A termne the adjustment ofsaid support, means for clamping the' saine in adjust-ed positi on, said base hating a flatlower face and .a

portion at one side thereof forming a straightedge, a pair of. gage-arms cairied by said base and extending laterally therefrom, said gagearms having rounded, vertically-disposed, bearing end portions' arranged above the lower flat surface ol said base'and inea-ns for adjust-inv saidarms to spread or contract the. sanie,.suzbstantially described.

3.- A piotzactor comprising a base having a 'portion thereof on one side forming 'a straight-edge and a portion on its opposite sideV parallel to said straight-edge forming a.

'guid-e, a pair of gage-arms mounted to slide 'o'n said guide, means for adjusting said arms and for clamping them iiiadjusted position,

and a vmarking-blade carried by sai d support,

'substantially as described. l y 4." A pretractor compi'isiiig'a bese having a .port-ion' thereof on one side forming a straight-edge and a portion ,on its oppositeon said-guide, means for adjusting said arms yand for clamping-tliem in adjusted position,

means for clampinr the saine in adjusted p0-' v 'sition, said -base iat-ing aportion thereof (fe-'arms' arranget to en- FIO a support' rotatably mounted on said base side parallel tosaid straight-edge forming a guide, a pair of, gage-arms mounted to slide .support rotatably mour'ited v onsaid base, verticallyfadjustable, rotatable member on aid support and a marking-bladecarried bv "said-member and longitudinally shiftable therethrough, substantially as described.

j '5. A protractor comprising a base having f'. a portion on o'ne side forming 'a's'traight-edg'e,

a pair'of gage-arms mounted onk the opposite 4 .sid'e of saidbase and having rounded bearingr ends` adapted .to abut against the rounded edgeof the work, asupport mounted on said base Atovrotate on `a verticalr axis, means for' clamping said support. in adiusted position, and ta-markingsg-blade carried by said support, substantially as described.

L g 6. .A protractor comprising a base having A aportion on one side forminga straight-edge, `a air of gage-arms mounted on the opposite si e of saidbase and'having rounded bearing ends 'adapted to abut against the. rounded edge ofthe work, a support mountedon said ba'sefto rotate onv apvertical axis,- means for I, `clamping said'support in adjusted position, av stud mounted o'n'said support to rotate on a.

horizontal axis' and alongitudinally-shifting marking-blade carried by `said stud, `substanysi e of `said base and having roundedabearing 'tially'v-asi described'.

, T7.` A protractorcomprisinga base having a. portion ori-'one side forming .a straightfedge, a air of gage-arms mounted on the opposite ends adapted to abut against 'the rounded 1 edgenfthe-work', a' support mounted on said base to .rotate on avertie-al axis, means for -clamping said supportdn adjusted position, a vertically-shifting blocklmounted to slide in guideways in said support, a stud mounted Onfsfaid block to rotate on a horizontal axis, a fqlongitub'dmally-shifting marking-blade carried said stud, means for clamping said vblock to' saidsupport and means for clamp-` 4mg said bladeto said stud, substantially as 8. A protractor comprising a fiat base hav- 'ing a portion thereof at one s ide forming a straight-edge, -a pairuof gage-arms mounted on the'opposite'side of. said support and having bearing ends adapted to' abut against the rounded edge of the piece of work, means engagmg said arms to spread or contract the same, a supportl mounted on said base to ro- State ona horizontal axis and :a .markingblade carried by said'support, substantially` thereonand mounted vto rotate on a horizonas described. l i i.

10. 'A protractor comprisinga base having a flat, lower surface, .a pair `of laterally-extending gage-arms mounted von said support and having rounded vertical end portions for engaging the rounded edge of apiece ofwork,

said arms and the end portions thereof being arranged above the'plane of the lower face of said base, means engaging said armsto tal' axis and a longitudiiially-shiftable mark-v. i ing-blade carried bysaid stud,.substa ntially spread or contract the same, a support i. mounted .on said base to rotate on a vertical 'axisA and a laterally-extending marking blade carried by said support, substantiallyI as described.

11. A protractor comprising a base, support rotatably mounted thereon, a laterallyextending niarking-blade carried by said support,. said base having va guide .formed thereon, a, pairof gage-arms mountedv to lslideon said guide and a right and left hand screw connected to said .arms to' spread and contract the same, substantially as described.

12. 'A protractor comprising abase, a support mounted thereon to rotateon a'vertical axis, a laterally-extending marking-bladeA carried,A by saidrsupport, said base having a guide formed thereon, a pair of gage-arms mounted to slide on said guide, a right and left hand screw extending through said'guide and connected to said armsto spreadand contract the same andv nuts on the ends of` guide, substantially as described. y i p 13. Aprotractor comprising a base, a sup port mounted thereon to rotate on a vertical axis, a laterally-extending marking-blade ysaid screw vabutting against the ends of said carried by said support, said base having a A guide formed thereon, a pair of gage-arms mounted to slide on said guide, a right and left hand screw extending through said guide and connected to said arm to spread and coutract the same and -nu'ts onl the endsfof said screw `abutting against the ends of said guide and having portions thereof journaled toro'- tate in sui'tablebearings formed on the ends of said guide, substantially asdescribed. A

14. A protractor comprising a base, a support mounted thereonto rotate on a vertical axis, a laterally'- extending markingblade carried by said support, said base having a guide formed thereon,a pair of gage-arms mounted to slide on said guide, a right and left hand screw extending through said ide and connected to said arm to spread an con-1` tract the same, nuts on the ends of said screw engaging the ends of said' guide and lock-nuts on said -screw engaging said first-mentioned nuts, substantially as described.

' '15.' Aprotractor comprising a base, a support mounted on said base to rotate o fi a ver-f tical axis,V a laterally-extending markingblade carried by said support, said base hav-l ing a guide formed thereon, a pair of laterallyv3,5 ,-markin extdngga 'warms-amountedw. slide YonV salmefand-nans'ffor'clamping said far-nis 'in 5' =adj'ustedposition;isubstaniallyas described.

lo;#iAfprotralctoreolnprising a'base, asupport mounted onsaidi .ba'seto-rotate onla- ,ver-

tical airis; a' laterallylextending" marking- 'blade't'carr'iedbjf`- said support', said base hav gifagti1deffo'rrnedtthereon,l a pair vof "latery 'Xt'endin joafiial s threaded-onsaidsoreW-andextendingthrough stadia fasydescribedif 17.f ot ctoxconiprisingfafbaseportion,

bladefca'I'riedby'Y saidj' support", said 'andi' screw" j ou'rnaled. within guide; va pair :of gagelarnzs sldepnf'said'guide, eyebolt's-havl eand-threadedon'saidscrew; vebolt "-j-'extendingf through. the inner A`sat'dealns and"v 1h avln'g; 'nuts thereon 3b pinglsaidarins infsaid adjusted' positionjfsubstantiallyasdescribed. l l

i f 1,85A Afprotractor comprising a'base' portion,

asupp'orton Said base portion mounted tov r o ltate-"on vertical axis, aA laterally-mrtendingl blade carried bysaid support, said ortionsarrangedi .AWithinsaid"bortand--lthreadedon1said'screu,

pljsitiolr;l substantially, asde's'cribedi 19": 'A protractor comprising abase-port ion, a supportmountedthereon to'rotate on a vertical axis, a laterally extending marking- 5o blade carried by said support and longitudinallt7 shiftable with respect thereto, salzl base I hvingfaigllide'fornzed thereon, f1- Pair of laterlall extending gage-arrns niounted to slide A onsaid `guideand a right and left hand screw f5-5 journaled in'se'iidlguide and connected to said armste spread and contract thesame, sub-` stantially as described. v

20. Apxotractor comprising a base-portion, a support mounted on said base portionto rosaid support-torot ate on a-liorizontal axis, 'a lon tudinally-'shiftable ntarkingblade carrie( by said stud, means for clamping said supportv and blade in position, s aid base hav- 6 5- ing -wguide 'formed thereon, a parrot laterallyhollowgui'deformedl thereon1 a;

extendingigagarrrisnzount'edt'o slide on said 'guide *and a@ -r ight and left hand screw j ournaled 'in said' guidef'and connected' to s'aid arms-to spread' and contractfthesame, sub'- v stantially asfdesciibed. l i 7o 21. A protralotor comprising 'a' base -portion, 'a'support niounted'on said'bas'efportion to rotate on a-vejrtieal axis,l a block mounted to slide on vertical'guideiays in said support,

'a stud carried'by'said block to rotateona 75 horizontalaxis,y a" longitudinally-shiftable1 marking-,blade carried' by"said1 :study ymeans for-'clamping said'support, vsaid fblock :and said'blade'in positionaid base hav ingahorizontal guide `formed thereon-a pair offlat'ere-S. I

ally-projecting.. vgagearrns' havingrounded" bearing en'd's Amounted toslidef'onlsai'd guide A and af right `and left lhandscrew-fjoilrfaled in. A said' uide-i and :connected-'Gtosaid-:farmsffo sprea'- 'v andy contract Itheisamegjsubstantiallyj '85 astdjeseribed( 22.Y A -protra'ctorcompris'ingfeaf.-'base*por tion; a-snpport or'standard-journaledbnfsaid1 basev portion' to rotati'on ftlie'ivertical*axis base. portion to rotate -on tl1e"vert'iealaxisro and having a ange engaging the upper Surfacethereof, a clamp-plate'on the underside offsaid-base, a clampfscrew-extendingithroughlsaid platefand supportor standard havingyaz nut 'ther'ednholding thesuppcrtbr standard? 1- m5 adjusted"v position', saldfstandarlfhavmgai' vertical' guideuay `formedon its facet a-'blvoclry i mounted -to slide" iii;sa.idf;guide, lfneans for clam pingsaidblock in'at'ljusted position,-and.r a1laterally-extending marking-blade""carried" 1ro port mounted thereon to rotate on' a vertical axis, aY laterally-extending, marking-.blade carried by said support, said base having a x15 horizontal guideway formed thereon, a pair of laterallY-extending gage-arms mounted to .slide on said horizontal guide and means engaging said gage-arms to spread -and con-y tract. the saine, substantially as described. x 2o 25. A protractor' coinp'risinga base, a support mounted thereon to rotate on a vertical axis, a laterally-extending marking-,blade car#- ried by said support, said base having a horizontal guideway formed thereon, apair ofrrzg, laterally-extending 'gage-arms. niounted to slide on said horizontal guide, means engaging sid arms to spread' and contract the same and nieansfor clamping said arms in adjusted position, substantially as described. 13otionfa standard o n said baseportlon to rotate on a vertical axis a`n z IIS.

.protractor comprising. a base porvertical guideway -formed thereon, a blc mounted to slide in said guideway, a 'stud mounted o'n said block to rotate on a horizont'al axis and alaterally-extending and longitudinally-shiftable marking-blade carried y said stud, substantially as described.

27. A protractor comprising a base lportion, a standardmounted on said base portion to rotate on a 'vertical axis kand having a vertical guideway formed' thereon, a .block mounted to slide insaid guideway, a stud mounted on said block to rotate on'a horizontalaxis, a laterally-extending marking-blade .carried by saidstud and'long'itudinally shiftabletherethrough, means for clamping said 'block in p ositionon said support and means for clamping said 'blade to said. stud and for holdmg the latter against rotation, substantialiy as described.

28. 'A protractor comprising a base, a sup- `vport -mountedthereon.torotate on 'a verticalaxis, a slotted stud carriedonsaidisupport, a laterally-extending'marking-blade extending through the slot of said stud, a shoe engagingv one edge'ofsaid blade` and a clamp-bolt extending" throughA said stud Y and having, a

beveled headngagingsaid shoe .and 'a' clampnut on said. bolt said'stud ,for holding said blade pos ition`,substantially as described. d A- l 29. `A protractor comprising a'ba'se, a vertic al support or standard mounted .thereon .to .rotate 1n a vertical axis, means for clamping .said support orstandard to said base, said supportor standard having a vertical guide- Way formedhe'reon, a slide-block inv said.

`deway, a clampscrew threaded into said lock havinga head for engaging the edges -of hsa'idguideway to hold said block in position, a tted stud mounted on said block tol rotate in" a horizontal axis, a marking-blade extending through the slot of said stud, a shoe en .aging one edge of said blade and a clampboI t carried by said stud engaging said shoe to lock said Ablade and A stui against mo vement, substantially 'as descrfberl.-

.30. A protractor. comprlsmg a base portion, a' pair of laterally-projecting ga e-arms mounted on said 'support and havin-g earmg ends adapted to abut against the rounded edge of a piece of work, means engaging said arms to spread and contractthe same, a support mounted on said base to rotate on a vertical axis,`means'for clampingsaid support 1n adjustedposition, a lon'tuinally-shiftable marking-blade carried y said support, a straight-edge mounted'to slide on said blade and means for clamping said strai, lit-edge 1n adjusted position on said blade, su stantially as described.

a vertica 31.- A protractor comprising a base por-4 tion, a su'gport mounted thereon to rotate on axis, a longitudinally-shftable markrg=blaelenrrl`ed l by said support, a marking-milena member whereonsmidmarking-roller is journaled and means for removably cl'amping said member to the end'of said blade, substantially as described.

' 32. A protractor comprisinga base, va support mounted on saidbase to rotate on a vertical ax s, a laterally-extending marking-g blade earned by'said support, apair .of laterally-extending gage-arms connected to said base andhavmg bearing ends adapteito abut against4 the edge ofthe work, members Whereon said arms are adjustably mounted and means engagng said members to spread,

' and contract thev same, substantially asdescribed.4 y

33. yA protractor comprising a' base, a sup-l port mounted on said base to rotate on a yertical aiL's, 'a laterally extending markingvblade carried by said support., a pair of laterally-extending gage-'arms .connected to said,1 base and having bearing ends adapte .i Lto abut againstthe-edgeof the work, members Wliereon said arms .are adjustably mounted,

'- means engaging said members to spread and contract the saine and means for'securing said arms to'said members and for locking vtlie latter' in adjusted position, substantially.

as described. v

.34. .A protractor comprising .a base, a suppor-t or standard mounted thereon'to' rotate. on a vertical axis, .a laterallyextending mar i -blade carried by vsaid vsupport or standard, said base having a horizontal guide formed thereon, a pair of slides on said guide, a right and left hand screw for spreading and contracting said slides, a pair o laterally-extendinggage-arms adjustably mounted on' said slides. and means for locking said ,slides in adjusted position and for clamping said arms to said slides, substantially as described.

35.l A protractor comprising a' base portion, a support or standard mounted thereon to rotate on a vertical axis, a longitudinallyshifting marking-.blade carried by said su Dort, -said base having a horizontal guide formed thereon, a-pair of slid es mounted on"v said guide, a right and left 'hand screw journalea in said guide, apair of laterally-extending gage-arms'adjustably mounted on said slid es and eebolt's connecting saidarms and slides to said right and left hand screw and nuts on'saideyebolts for clamping said arms and slides in adjusted position, substantially as described.

ABRAHAM ANDERSON.

Witnesses:

HENRY Horan, A GEORGE CoRDTs.

IIC