US762072A - Leveling instrument. - Google Patents

Description

' PATENTED JUNE '7, 1904-..

P. LURD. LEVELING INSTRUMENT.

APPLIGATION FILED' JUNE 12.1903.

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"obtained at considerabledistances apar-twitll-Z Nok/162,072.

UNITED STAT-Es 'A Patented'June '7, 1904.`

PATENT OEEIcE.

PETER LORD, 0F WORCESTER, vMAssA cHUsE'rrs.

LEvELlNe.v nasi-nulliENT.'

SPECIHCATIO forming part of Lettesjratent No. 762,072, dated June 7, l904.-

Application filed Jima 12, 19Q3.

serial No. 161,149. :un model.)

e Be il-.sknozwrjl thatIrPmmnfLo'RD, eff tuscany .Y and ceuntyfofz Worcester and State of Massa-5 chusettstha've in-ventedge'eiitain new,'andllsefu'lgjl 1 ,ImPPQVYIiGHtS-n Leveling lStllimnt'slIif: do lhereby' declare; that the following isefull, clear, and exact descrption.tllereofifleterence-` being .had Etoa the-accompanying drawings, l formingr v apart offlvtll-is'*'specicatimand vEi'gurejl rcpres'entsa sideviewfof` one vofthe levels otmy saidim'proved leveling ,instru-f .,ment. j Fig. 2 isa: central vertical sectionthereof. 'Fig.`3s a top orplan yiew'f'of'saidv level';` and Fig.f4:representstl1e two-leveled* the leveling1i-nstrument,which are connected by a flexible 'tu'be, a`s and for the purpose here; v

inaftel described.:.5."1:

out thexuseofS-an eilgineers transit or levelinginstrunlent; and it consists 'of two separate. levels-otl special cfaonstruetion 'connectedl by a' -llexibleftubeiforobtaining an uninterrupted `fluid connection between said two levels, as

and for thepurpose hereinafter; more fully set forth.' f

loA enable others to better 4lindersta'nd the nature and" purpose' of *my said invention, l? will nowproceed to describe'it-nlo're in'detail.v4

" .Referring -to' the drawi, 2,s` A A represent the two separate levels, and 'U the flexible connecting-tube before alluded to. As the. two

levels are alike, a description ofthe construe-H tion of one wlll servev for botll. Said construction is as. follows: a isa metal tube slotted on opposite sides nearly its entire len,grth,

.vv so as to admit of looking-through the same. c 4o Said metal tube is both externally and interfnally threaded .at its bottom end and internally threaded at its upper end-i A hollow base having a hu'bwith internal threads, is

screwed to the outsidefof. said bottom endlof tube a., and a plug c, having external threads, vis screwed into said bottom end. A head d, having an externally-threaded hub, is screwed into the upper tllreaded end of said tube (l, and inside of tube rz. between said head d and plug o is arranged a glass tube e, whicll seryes nventioii .is to( provide af when naleven-11gananas injotlr leveling instruments; v The end of the connecting-tube wise to hold'it from slipping off. The oppositel end "of S'aid g'las'sJ-tube' has attached theretoin thesameway the bottom end ofy a thin rubber case orjbagfQ-which extends above the head d, v6o

as ifssh'C vffvn:il'l'rjli'gz: 2,2.the purpose thereof being toiprevent the fluid from flowing out at the u pper'fend and alsof` t'o--forln a 'vent for the air fromV v the glass tube -topernlit the fluidto.freely 'flow through the connecting-tube C and the165 glass tubes 2e (l either direction,v according towhic'll level is'at the highest elevation. 'lo

screwed to the upper vend ofhead al, --whichis provided with a small ve nt-llole' f7'4 (see Figi-BY 70 connecting-tube C on the bottoni vends of 4the i y glass tubes e e and thenecks of the rubber 75 l easesfj on the upper ends ot' said glass tubes, 'thelatterl v,may l be Jformed Wlth an y annular groove'e at each end, as is shown .in Fig. 2. The outer nletal'tubes are also p'lovldedivlth gage-marks L, as 'ls shown 1n Flg.' 1, to lndl# 8o cate the 'level of the water z' in the glass tubes. y

y'An luninterrupted connection'f the fluid-pas# -sa'ge is maintained between. one glass tubeand the other through theflexibletube" C, and it l is therefor@ obvio-11S that lri matter how long. 85'- said tube maybe if Athe salnelis tilled with ivatem.` j

v'or other thin fluid that will -llow and iindlitsvlevel'readil y tllelve'l ofsaid water will be 'indi' f cated in` the glass tllbe,fth`e 'saule raisingior lowering` theleln' 'the levels in leveling.. 'l

, By the use of such an instrument ,com prisf ling; twov le'velil'lg parts ywith a long tube' eqnnectllon between ther'rn-as described, ltls also j obvious that many levels may be obtained that 95 it is dificult, and in some cases impossiblmgto obtain with an A ordinary levelinginstrument;

I prefer in practicetoconstruct the instru-v ment wltll a single conncctlng'tube between two separate-levels, as described and shown lO according to the elevation of' "9o by Fig. 4; but, if desired, the same principle may be carried out by arranging two vertical glass tubes transversely in the ends of a long pole D and connecting said tubes by means ot' two longitudinal tubes Z Z, arranged in suitable grooves in said pole AD and inclined from the outer edge of thel center of the pole inward toward each end, so that when either ltube l cornes uppermost .the water will flow out of it toward each end into the transverse glass tubes and the bottom longitudinal tube. By thus having two levels and arranging them at the ends of a long pole it does not matter whether the pole is straight or not, vas the leveling is established by the height of the end rather than by the straight-` ness of the pole or bar in which the glass tube is placed when only one tube is used. In view yot' the above 1 reserve the right to use either one or two Huid-connecting tubes between the glass tubes and to make such other modilications in the construction as circumstances may require in practice.

Having now described my invention, what l claim therein as new, and desire to secure by Letters Patent, is-

l. A leveling instrument comprising in combination two separate levels, each consisting of a slotted metal outer tube h'avinga base and head secured to opposite ends thereof,- a plug screwed intoA the bottom. end of said metal tube, a glass tube arranged4v insaid 2.1m a leveling instrument, the combination of two glass tubes e e, and means for holding them in position, comprising the slotted, metal tubes a, their bases b, heads d and plugs c, with elastic cases f, attached to the upper ends of said glass tubes, caps g, arranged over said elastic cases and flexiblev tube C, connecting one glass tube with the other, substantially as and for the purpose set forth.

l l PETER LORD.v Witnesses:

A. A. BAKKER, E. N. BARKER'.

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