Abstract: The surveying system comprises a theodolite which provides digital data from electro-optical horizontal and vertical circle reading components and includes a level sensor which generates digital data relative to the attitude of the vertical axis of the instrument. Additional means are included for presetting instrument correction and scaling factors which together with angle and level data are processed by an on-board microcomputer to yield accurate digital displays of horizontal and vertical angles. Provision is also made for the input of digital slope range data from an electronic distance measuring instrument to be displayed directly or processed with horizontal and vertical angle data by the microcomputer to provide vector coordinates of the observed target. In response to operator selection from parameter and vector functions the control program cycles the processing of relevant data in order to provide a repeatedly updated display of any desired function.

Abstract: Focusing mechanism for a telescope utilized in geodetic instruments and the like comprises a pair of manually accessible ring members mounted coaxially of the line of sight axis at the eyepiece end of the telescope. Rapid image acquisition is effected by means of a first of the rings which is associated with a multiple lead screw element while fine focusing is obtained by means of the second ring member which operates a single screw thread drive for the draw tube focusing lens assembly.

Abstract: A photopolymerizable composition useful in photo-imaging processes comprises an ethylenically unsaturated polymerizable compound and a photoinitiator comprising a combination of a photoreducible dye and an alkanolamine. The composition is substantially insensitive to visible light when in an acidic pH condition, yet may be made highly sensitive to visible light upon adjustment to a condition of alkaline pH. Imaging materials may be repeatedly sensitized and desensitized by pH adjustment and multiple-spaced exposures made prior to final washoff development processing.

Abstract: Fine adjustment of a surveying instrument telescope reference spirit level is effected by rotating the bubble vial of the level about an axis which is slightly angularly displaced from the longitudinal axis of the vial.

Abstract: Sheet material useful in the preparation of draftsmen's and engineers' plans and drawings comprises a base support, preferably of a stable polyester film, bearing a translucent pencil- and ink-receptive coating comprising finely-divided silica pigment dispersed throughout a binder matrix which is essentially a cross-polymerized reaction product of a mixture of a relatively low molecular weight acrylic or methacrylic ester vinyl monomer, a drying oil acrylate, and a blend of polyene and polythiol radiation curable polymers. The coating composition is substantially devoid of volatile solvent vehicle, yet is readily set to a functional drafting surface by exposure to actinic radiation, such as ultraviolet light.

Abstract: Means for producing a counter reset pulse at the precise zero datum in an electro-optical measuring device comprises a sub-assembly including a light source, a patterned reticle, and a pair of photosensors, and a cooperating imaging reflector element. Each of the sub-assembly and reflector element are respectively mounted on the separate portions of the measuring device between which relative movement is effected during the measuring operation. Light from the source illuminates a pair of parallel transparent slots in the reticle pattern and is imaged back upon a second pair of transparent windows in the same reticle by the reflector element and is incident upon a pair of photosensors, each of which is associated with one of the windows. Equal illumination of each of the photosensors establishes the precise zero datum in the device and associated electronics provides a counter resetting pulse at that position.

Abstract: Telescope elevation controls in a geodetic instrument include coaxially mounted control knobs which respectively effect positive clamping of a lever arm member to the telescope axle, and fine adjustment drive of telescope elevation. Kinematic bearing means are also provided along with telescope plumb line adjustment means capable of effecting true vertical telescope axle adjustment.

Abstract: A level indicator providing a digital display of gravity-related attitude comprises a capacitive gravimeter pickup assembly the complementary capacitor pair of which are alternately switched, on an equal-time basis, into an R.C. oscillator circuit. Concurrently, each oscillator pulse train is switched, respectively, into the up- and down-mode of reversible counting means to yield a net oscillator frequency difference directly, digitally indicative of the degree of departure from a gravity-referenced level condition.

Abstract: A carrying pouch for a cardiac telemonitor transmitter unit is made of a soft absorbent sheet material, such as an open-pored non-woven fabric, and includes a pair of ribbon tie strips by which the carrier may be affixed about the neck and chest of a cardiac patient to secure the transmitter against artifact generating movement. A seam vent in the pouch permits ready access to the contact lead coupling means on the transmitter.

Abstract: Polymerization of an ethylenically unsaturated compound is achieved by means of free radical initiators derived from the reaction of an aldehyde/bisulfite adduct with cupric ions resulting from electrolysis involving a copper anode. By including a photoconductive cathode in the system image-wise light exposure effects the formation of polymeric images in the polymerizable composition.

Abstract: A photopolymerizable composition useful in photo-imaging processes comprises an ethylenically unsaturated polymerizable compound and a photo-initiator comprising a combination of a photoreducible dye and an alkanolamine. The composition is substantially insensitive to visible light when in an acidic pH condition, yet may be made highly sensitive to visible light upon adjustment to a condition of alkaline pH. Imaging materials may be repeatedly sensitized and desensitized by pH adjustment and multiple-spaced exposures made prior to final washoff development processing.

Abstract: Polymerization of an ethylenically unsaturated compound is achieved by means of free radical initiators derived from the reaction of an aldehyde/bisulfite adduct with cupric ions resulting from electrolysis involving a copper anode. By including a photoconductive cathode in the system image-wise light exposure effects the formation of polymeric images in the polymerizable composition.

Abstract: Material useful in electropolymerization processes comprises a conductive support and a layer thereon of a composition comprising a polymerizable monomer and polymerization catalyst precursor which is a combination of an alkali metal nitrite and a primary aromatic amine. Electrolysis of the composition results in diazotization of the amine with subsequent electrolytic generation of polymerization-inducing free radicals. The anodic reaction ensures polymerization at and bonding of the resulting polymer to the support sheet of the material even when used in conjunction with zinc oxide photoconductor cathode layers. The material is particularly useful in negative-working imagery and in the preparation of patterned resist layers.

Abstract: A precise indexing detent comprises a pair of grooved members the plane groove faces of which define a polyhedron within which there may be positioned a sphere in surface contact with all such faces. A detent member comprising a spherical section is situated in close association with the grooved members to govern the positional indexing of movable apparatus parts as in a level-transit surveying instrument or drafting machine protractor head.

Abstract: Material useful in electropolymerization processes comprises a conductive support and a layer thereon of a composition comprising a polymerizable monomer and polymerization catalyst precursor which is a combination of an alkali metal nitrite and a primary aromatic amine. Electrolysis of the composition results in diazotization of the amine with subsequent electrolytic generation of polymerization-inducing free radicals. The anodic reaction ensures polymerization at and bonding of the resulting polymer to the support sheet of the material even when used in conjunction with zinc oxide photoconductor cathode layers. The material is particularly useful in negative-working imagery and in the preparation of patterned resist layers.

Abstract: Diazotype material includes a light-sensitive diazonium compound of the general formula ##SPC1##Wherein:R.sub.1 and R.sub.2 are substituted or unsubstituted alkyl, aralkyl, or cycloalkyl groups, or form, with the nitrogen atom, a heterocyclic radical, which may be substituted;R.sub.3 is hydrogen or the group OR.sub.6 ;R.sub.4 and R.sub.5 are hydrogen, halogen, alkyl, or OR.sub.6 groups;R.sub.6 is alkyl; or fluorinated alkyl, alkenyl, cycloalkyl, or cycloalkenyl; andX is the anion of the diazonium compound;At least one of the radicals R.sub.4 and R.sub.5 is hydrogen; and at least one of the radicals R.sub.3, R.sub.4, and R.sub.5 is one of said fluorinated radicals, at least one of said fluorinated radicals being further substituted by other halogen atoms, hydroxy groups, acyloxy groups, alkoxy groups, alkylated or acylated amino groups, or aryl radicals.