Groove small

Assemble a 250 ml. three-necked flask, fitted with a stirrer, a reflux condenser and a dropping-funnel, as in Fig. 22(A) and (j), p. 43, or Fig. 23(c), p. 46 (or a two-necked flask, with the funnel fitted by a grooved cork (p. 255) to the top of the condenser). Place 40 ml. of ethanol in the flask, and then add 2-3 g. of sodium cut into small pieces. When all the sodium has dissolved, heat the stirred solution on the water-bath, and run in from the funnel 17 g. (17 ml.) of ethyl malonate and then (more slowly) io-2 g. (12 ml.) of mesityl oxide, the reaction-mixture meanwhile forming a thick slurry. Boil the stirred mixture under reflux for i hour, and then add a solution of 10 g. of sodium hydroxide in 50 ml. of water, and continue boiling the pale honey-coloured solution for ij hours more. 

A low melting (5°C) gallium—indium—tin alloy has been the choice for small spiral-groove bearings in vacuum for x-ray tubes at speeds up to 7000 rpm (71). Surface tension 30 times that of oil avoids leakage of the gallium alloy from the ends of the bearings. 

Fan (flat) spray. a. Oval or rectangular orifice (see Fig. l4-87c). Numerous variants on cavity and groove exist. Liquid leaves as a flat sheet or flattened ellipse. Combination of cavity and oriBce produces two streams that impinge within the nozzle. Flat pattern is useful for coating surfaces and for injection into streams. same pattern with different fluids. Small clearances. 

If pH is unusually low within the tubercle, the floor may be heavily striated. Small, shallow parallel grooves will appear in the depressions beneath each tubercle (Fig. 3.24). The striations are caused by preferential corrosion along microstructural defects such as deformed metal. 

Figure 8.7 Small grooves on the tube shown in Fig. 8.6. Grooves are condensate rivulet paths cut into the tube surface. (Magnification lOx.)...

When 6, die groove angle is small, die widdr between die two maxima, W, on eidrer side of a surface groove is obtained from die values... 

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