Air Supply Board

It was by now apparent that the Browning gun position was not as precarious as was at first feared, and justification for the Dudley scheme was not so immediate. Under pressure from BSA, who were never very keen on the project, the Air Supply Board therefore decided not to move their capacity to the tunnels and the site was instead offered to the Air Ministry for use as an ammunition store. Towards the end of July the Air Ministry also decided against Dudley as the tunnels were too small. The MAP then approached the MOS which also rejected the site, which was subsequently abandoned. 

Abandoned by Air Supply Board, 228 Conversion cost, 227 Rejected by RAF, 228 Supply Board investigation, 227 Table of costs, 228 Dudley zoo, 148 Dynamometers, 173... 

The feasibility of providing underground factories was first discussed at a meeting of the Air Supply Board in September, 1940, where the concept was seized upon enthusiastically by the Minister of Aircraft Production, Lord Beaverbrook, a man of overbearingly powerful... 

Three further proposals emerged the following year. In mid-April the Air Supply Board informed the Treasury that they intended to build an underground factory of 250,000 square feet at Drakelow near Kidderminster, into which it was intended to transfer some vital part of an aircraft component factory. No end user was specified, a MAP memorandum noting that ... 

If the analyses are to be performed on board, the room in which the samples are prepared and analysed should, in fact, be built as a clean room. Many modern oceanographic vessels are constructed to accept modular laboratories, which can be removed between voyages. Clean room modules, complete with air conditioning and filtered air supply, have been built for several vessels. It is possible to perform accurate, precise microanalyses on board ship under less favourable conditions, but the analyst is really fighting the odds. 

FIGURE 9.24 Plot of measured aerosol fine particle volume (including only those particles of 0.T to 1.0-/xm diameter) versus measured i>sp. Measurements were part of the State of California Air Resources Board ACHEX program (adapted from Waggoner and Charlson, 1976 data supplied by Dr. Clark of North American Rockwell). 

Figure 13.15 shows the operational scheme of this automatic tltrator. The heart of the unit Is an INTEL 8080 microprocessor mounted on the central processing unit (CPU) board. The rotary reaction cell assembly can accommodate up to three different sensors for multiple measurements on the same processed sample. Each stepper burette board controls up to two burette dispensing assemblies. Function boards such as the colorimeter board, air burette board, E/I output board and RS-232 printer Interface boards are available optionally. The optional D/A and E/I board is used for closed-loop applications where the tltrator controls the final element such as a control valve. The RS-232 printer Interface board Is useful for troubleshooting the equipment and editing user-defined programs. The Instrument accuracy, repeatability and response time vary widely and depend on the particular type of measurement concerned. The system requires a.c. power, a 75-psl air supply and a dilution water supply for proper operation. The air flow-rate required is of about 50 cm3/mln... 

In the first step of the test procedure, the flammability of a red oak specimen is measured. With a correct adjustment of the experimental conditions (gas flame, air supply), the flame reaches the end-point of the wood specimen in 5.5 min. The thermocouple reading and the photoelectric cell output at the vent end are recorded every 15 s and the curves of the flame spread distance and the smoke density are plotted against time. In the second step, the same procedure is followed using an asbestos cement board then, in the third step, using the test specimen. 

Remove louver boards. Some counterflow and straight-sided crossflow towers have the top louver board and every fifth louver beneath of double width. The intermediate louver boards may be removed, thereby reducing the amount of ice forming between these louver blades and choking off the air supply. 

The linear power supply finds a very strong niehe within applieations where its ineffieieney is not important. These inelude wall-powered, ground-base equipment where foreed air eooling is not a problem and also those applieations in whieh the instrument is so sensitive to eleetrieal noise that it requires an eleetrieally quiet power supply—these produets might inelude audio and video amplifiers, RF reeeivers, and so forth. Linear regulators are also popular as loeal, board-level regulators. Here only a few watts are needed by the board, so the few watts of loss ean be aeeommodated by a simple heatsink. If dielee-trie isolation is desired from an ae input power souree it is provided by an ae transformer or bulk power supply. 

Example 9.1 Methanol is saturated into a thick board of porous ceramic fibers. The board is maintained wet with a supply temperature at ambient of 20 °C. A steady air flow is directed across the horizontal board at 3 m/s. The board is 10 cm in the flow directions, and is placed flush with the floor. Use the following property data ... 

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