THRESHOLD COMPLEX EXPLORATION LOG
Designation / Log ID: 59-D56
Apparent Date/Time: 04 October 2026 / 09:19 (local) — secondary stamp reads 02:11 08 November 1962
Entry Method: Service door marked “T-61 TELEPHONE EXCHANGE – FRAME”. Exterior clear aperture measures 0.89 m × 2.01 m. Interior aperture measures 0.74 m × 2.21 m on entry and 1.07 m × 1.82 m on exit.
Environmental Baseline
Lighting: fluorescent troffers, color temperature measured at 3900 K. Intensity constant at 165 lux.
Ambient temperature: 19.6 °C. Humidity: 44 %.
Background sound: switch click at 0.3 Hz. Baseline reading 24 dB.
Air movement: none detected. Barometric pressure 1011.4 hPa on entry; 1019.2 hPa after 3.8 m of travel.
Spatial Observations
Gallery estimated 18 m long by 7.2 m wide by 3.1 m high. Laser measurement returns 12.4 m long by 8.6 m wide by 2.4 m high.
Floor: linoleum tile with inlaid cable-run stripes. Stripe width measures 60 mm. Surface remains uniform under repeated contact.
Walls: painted block with one main distribution frame and one attendant desk. Frame height measures 2140 mm. Surface remains uniform under repeated contact.
Ceiling: acoustic tile with ten troffers. Fixture count remains ten after six visual inventories.
Repeating motif: every 0.45 m a jack strip occupies the frame. Strip span measures 480 mm. Finish is identical across all units.
Anomalies
Visual inventory of jack positions returns 240. Physical inventory returns 240. Measured occupied-jack count equals 0 while calculated residual occupancy across the same frame equals 37.
Floor remains level under spirit level. Measured residual patch cords on the frame edges slope 1.4° toward the outbound wall. Slope reverses after 5 minutes of observation without change in physical orientation.
Posted frame plaque reads 240 JACKS / 0 LINES. Measured combined indicator-lamp current equals 0.0 A. Line lamps remain amber.
Sound of residual switch click arrives 1.8 seconds after the corresponding relay motion is detected. Delay increases by 0.13 s for every additional 1.0 m of distance from the entry door.
Humidity at mid-gallery remains 44 % while residual condensation forms on the attendant desk edge after 7 minutes of observation. Condensation disperses without measurable change in humidity.
Magnetic field strength measures 0.4 gauss at floor level and 2.1 gauss at 1.5 m height. Field direction reverses after 8 minutes without change in gallery state.
Patch-cord stock on the open drawer decreases by 9 over 11 minutes while measured drawer-lock current remains 0.0 A.
Surface of residual condensation on the desk edge exhibits surface tension hold of 2.1 cm against vertical laminate. Hold collapses after 41 seconds without measurable change in fluid volume.
Cable-run stripe migrates 5 mm toward the inbound wall over 6 minutes. Stripe returns to original alignment without measurable change in floor temperature.
Desk height measures 760 mm on first inventory and 910 mm on second inventory of the same desk. Desk returns to 760 mm on third inventory without change in wall position.
Strip span measures 480 mm on first inventory and 410 mm on second inventory of the same strip. Strip returns to 480 mm on third inventory without change in frame alignment.
Recorded click interval equals 3.33 s on the first 12 cycles and 4.80 s on the subsequent 12 cycles. Interval returns to 3.33 s without change in relay state.
Desk surface temperature measures 19.6 °C. Residual heat print on the same laminate measures 31.2 °C after 6 minutes without measurable change in ambient temperature.
Handset on the attendant desk registers 0.0 V across tip and ring. Dial tone is present at the earpiece. Tone ceases after 14 seconds without change in line state.
Entity Notes
None observed.
Exit / Continuity Status
Exit achieved through the same service door after 31 minutes of observation. Exterior aperture on exit measures 1.07 m × 1.82 m. Residual cord marks on gloves dissipate within 8 minutes of exit. Magnetic field returns to baseline 0.4 gauss within 11 minutes. No further residual effects recorded.