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24.3 The bases of surface type socket-outlets are first fixed to a cylinder of rigid steel sheet,9 x' a# M9 U/ q. P+ C% `
having a radius equal to 4,5 times the distance between fixing holes but, in any case, no less
' Z! G; D1 ~) O; v3 jthen 200 mm. The axes of the holes are in a plane perpendicular to the axis of the cylinder
" a2 O' [: }' }and parallel to the radius through the centre of the distance between the holes.
; S8 g& W3 @8 X" M4 N; _- HThe fixing screws of the base are gradually tightened, the maximum torque applied being; x1 Y: p3 {6 R) U
0,5 Nm for screws having a thread diameter up to and including 3 mm and 1,2 Nm for screws
+ D1 N! k$ W* phaving a larger thread diameter.! K j4 g) d) M& r/ X
The bases of socket-outlets are then fixed in a similar manner to a flat steel sheet.* d: s1 n: c8 u1 C' A0 z; p7 e2 F
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问题:这个试验装置是什么样的?
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