Abstract: An edge connector (1) comprises a housing (2) having an aperture (3) in which an edge (6) of a circuit board (7) is received. One or more connector pins (12) (13) extending from the housing each have a sharp-edged contact region (19), plated with a ductile metallic material such as tin or lead, and capable of penetrating and deforming a similarly plated contact pad (20) to establish a low resistance electrical connection therebetween. The housing (2) and the circuit board (7) are pivotable with respect to one another between a first position in which there is clearance between the connector pins (12) (13) and the contact pads (20) present on the circuit board, and a second position in which they are in electrical contact one with the other. Securing means such as resilient clips (25) (26) (30) (34) hold the circuit board with respect to the housing (2) in the second position.

Abstract: A distance measuring apparatus comprises a first modulating cavity for modulating a first electromagnetic carrier radiation, the modulated first electromagnetic carrier radiation being transmitted over a path the length of which is to be measured and received by a second modulating cavity which determines the modulation phase thereof. The second modulating cavity also modulates a second electromagnetic carrier radiation in accordance with the modulation phase of the received modulated first electromagnetic carrier radiation and transmits the modulated second electromagnetic carrier radiation back over the path the length of which is to be measured. The first modulating cavity detects the modulation phase of the received modulated second electromagnetic carrier radiation and produces therefrom an indication of the length of the path.