Subsurface signal transmitting apparatus

A subsurface signal transmitting apparatus for connection into a tubing string in a bore hole, said apparatus comprising;

• an insulation connector assembly,
• an instrument carrier device,
• said connector assembly including an outer housing member having a first connection means adjacent one end of the connector assembly for attachment to an adjacent tubular section of said string above said connector assembly, an inner mandrel member having a second connection means for attachment to an upper end of said carrier device, said mandrel member being of tubular form defining a central passageway from said one end to said other end of said connector assembly, and means for electrically insulating said housing member from said mandrel member;
• characterized by said carrier device including an elongated tubular member having external channels for accommodating instrument sensing units,
• an internal passageway in said tubular member communicating at an upper end with said passage-way in said mandrel member and a lower end of said tubular member,
• said tubular member having a third connection means at a lower end thereof for attachment of said carrier device to an adjacent section of said string below said carrier device, and
• an electrically insulated by-pass tube extending through said passageways of said mandrel and said carrier device and having fourth and fifth connection means at upper and lower ends thereof, respectively, for connection of opposite ends of said by-pass tube to said sections above and below said apparatus for permitting fluid passage through said apparatus.