Instrument holes

The instrument holes, VG-27, 28, 42, 44, and 56 are vertical holes extending to elevation 96 ft 0 in. in the permanent graphite. They will contain 

The reaaining instrunent holes, GM-1 and GM-2, are thimbles projecting into the exit water lines. They proride space for the y- ray ion chambers which monitor the activity in the exit water. 

S Experimentnl Holes. Holes VG-1, 3, 5, and 6 are pebble zone holes with 4- in.- I.D. fluted aluminum liners extending to elevation 96- ft 2-5/8 in. At the bottom the centerline of these holes is approximately 2 ft 8 in. from the vertical centerline of the reactor. For start-up they are equipped with barytes plugs from which are suspended 31i-in.-diameter GBF graphite plugs. 

Holes VG-7, 9, 10, and 16 through 20 are also pebble zone holes but with -in.-I.D. liners extending to elevation 98 ft 4 in. At this elevation the centerline of the liners is 2 ft 10 in. from the vertical centerline of the reactor. The graphite plugs provided for start-up are 2i( in. in diameter. 

VG-9 is a large (10 by 10 in.) square hole penetrating the permanent graphite to elevation 100 ft 6 in. directly above HG-9. The centerline of the hole is 4 ft 5 in. from the vertical centerline of the reactor. The graphite 

---

Instrument Holes. Access to HI-2- and HI 3 is obtained through the east and west faces of the reactor structure. These holes are to be used for the... 

The MTR has 71 experimental and instrument holes accessible from the top of the reactor. The general layout of the top surface of the reactor with essential dimensions indicated is shown,in Fig. 3.E. -Details of the hole locations and the numbers assigned to them are given in Fig. 3.F. It is only fair to warn the reader that holes VG- 21 and VG-22 are nonexistent they were lost in the shuffle. 

Quite often problems arise when instruments for normal seiwice are subjected to low temperature use. Since some metals become brittle at low temperatures, the instrument hteraUy falls apart. Elastomeric gaskets and seals contract faster with decreasing temperatures than the surrounding metal parts, and the seal often is lost. Even hermetically sealed instruments can develop pin holes or small cracks to permit ciyogenic liqmds to enter these cases with time. Warming the instrument causes the trapped hquid to vaporize, sometimes generating excessive gas pressure and failure of the case. 

S. J. Pennycook. EMSA Bulletin. 19, 67, 1989. A summary of compositional imaging using a high-angle annular dark-field detector in a field emission STEM instrument published by the Electron Microscopy Society of America, Box EMSA Woods Hole, MA 02543. 

As well as measurement errors due to the pressure measurement instrument itself, other errors related to pressure measurements must be considered. In ventilation applications a frequently measured quantity is the duct static pressure. This is determined by drilling in the duct a hole or holes in which a metal tube is secured. The rubber tube of the manometer is attached to the metal tube, and the pressure difference between the hole and the environment or some other pressure is measured. 

It is essential to ensure that the following criteria are met otherwise errors will result. First, the mouth of the hole inside the duct must be smooth and flush with the duct inner surface. No burrs or other irregularities must be on the surface in the vicinity of the hole. Second, the hole must be perpendicular to the tube axis. The size of the hole has an effect on the measured pressure as well. A general rule is, the smaller the hole the better. Very small holes do, however, slow down the response of the instrument. Usually the hole diameter is a few millimeters. Note also that the smaller the hole, the greater the risk of blockage. Further information on the effect of the hole size can be found, e.g., in Ower and Pankhurst. 

Walk (of hole) The tendency of a wellbore to deviate in the horizontal plane. Wellbore survey calculation methods Refers to the mathematical methods and assumptions used in reconstructing the path of the wellbore and in generating the space curve path of the wellbore from inclination and direction angle measurements taken along the wellbore. These measurements are obtained from gyroscopic or magnetic instruments of either the single-shot or multishot type. 

Sample cells were fabricated from tungsten. Additional crucibles composed of a Pt-40 w/o Rh-8 w/o W alloy were also used in experiments on the PuPt phase. Each tungsten cell was vacuum outgassed at 1800 for 1 h before an experiment. The cell temperature was determined during the measurements by sighting with a pyrometer (Pyrometer Instrument Co.) onto a blackbody hole in each cell base. The pyrometer and sight glasses were calibrated with an NBS standard lamp. 

In one laboratory, an atomic absorbtion instrument was placed on top of a three-foot knee-hole. Drainage from the instrument s atomizer went into a bottle underneath. Data from this instrument was recorded on a strip chart recorder placed on a typewriter stand. When in use, the recorder was at the operator s right, where it was easy to observe and adjust. WTien not in use, it was kept out of the way in the knee-hole, along with the operator s stool. 

An experimental fluidized bed reactor has a 2.5 cm in diameter and 230 cm in height, and the distributor has 32 holes and each hole was 2 mm in diameter. 200 mesh net was put on the distributor to prevent particles from falhng down. The cyclone was made by standard proportion to collect fine particles. Air flow rate was controlled by a flow meter, CO2 (99.9%) flow rate was controlled by mass flow controller and then 10% CO2 inlet concentration was maintained by mixing in a mixing chamber. CO2 outlet concentration was also measured by CO2 analyzer (CD 95, Geotechnical instruments, England). 

Figure 36, Instrument for emptying three can three channels, 302 represents the various holes in the block, 304, capillary as it is being placed in the block 306, 307, and 308, connections which are made each with a separate capillary so as to move the specimen from the capillary into the analyzing system. The inset on the right shows how the connector 306 moves into the depression in the block to make contact with the capillary holder. Number 47, capillary in this inset.

Fig. 3.15 Left External view of the MIMOS II sensor head (SH) with pyramid structure and contact ring assembly In front of the Instrument detector system. The diameter of the one Euro coin is 23 mm the outer diameter of the contact-ring is 30 mm, the inner diameter is 16 mm defining the field of view of the Instrument. Right. Mimos II SH (without contact plate assembly) with dust cover taken off to show the SH Interior. At the front, the end of the cylindrical collimator (with 4.5 mm diameter bore hole) Is surrounded by the four SI-PIN detectors that detect the radiation re-emltted by the sample. The metal case of the upper detector is opened to show its associated electronics. The electronics for all four detectors Is the same. The Mossbauer drive is inside (in the center) of this arrangement (see also Fig. 3.16), and the reference channel is located on the back side In the metal box shown In the photograph...

Ice is sold in the out-parts of the City in open places Their way of making it is thus... In less than eight Days Working after this Manner, they have Pieces of Ice five or six Foot thick and then they gather the People of that Quarter together, who with loud Shouts of joy, and Fires lighted upon the Edges of the Hole, and with the Sound of Instruments to Animate them, go down into it, and lay these Lumps of Ice one upon the other [1],... 

An instrument can be used to test tank walls directly, for example, by using acoustics or sound waves to identify holes or cracks in the tank walls.18... 

Iron mixed-valence materials such as green rust and fougerite are sensitive to air exposure and soil pollution by nitrates. A MIMOS instrument autonomously lowered or raised within a plexiglas tube, which was put down a bore hole, allowed... 

---