Photocell-mounted spirit level as two-axis surface level detector with DC output
Plane-level gives electrical output.
1965-05-01
Miscellaneous
No indication
English
Smaller output estimated for 1930 gives assurance of stability
Engineering Index Backfile | 1929
|On Line Washing Gives Firm Output Gains for UNA
Online Contents | 1993
Gives results of experience with electrical motor on street railways
Engineering Index Backfile | 1882
|British Library Online Contents | 1996