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Halyard Instrument Co.Drawing set HL-2291ISO 128 · Third angle

Atlas 9
Field LanternGeneral arrangement

The Atlas 9 is a brass-bodied field lantern built for coastal survey crews working eighteen-hour rotations in salt spray. Every dimension on this sheet is taken from the machined master at 20 °C. Drawings are read left to right, top to bottom; callout bubbles cross-reference the parts schedule on Sheet 03.

Sheet 01

Front elevation

View A — datum at base plane
Fig. 1.1 — Elevation Scale 1:2 · mm Front elevation of the Atlas 9 field lantern Outline drawing showing the bail handle, vented cap, borosilicate globe, brass body and base, with overall height 412 millimetres and globe diameter 118 millimetres. 412.0 132.0 Ø118.0 152.0 14° 1 2 3 4 5 6 7

Parts schedule

  1. All linear dimensions in millimetres unless otherwise stated.
  2. Remove burrs and break sharp edges 0.3 max.
  3. Brass components to be lacquered after final polish; do not lacquer sealing faces.
  4. Globe seat to be tested at 40 kPa for 60 seconds, no leakage permitted.
  5. Do not scale from this drawing.
Sheet 02

Section B–B

Cut on vertical datum · hatch at 45°
Fig. 2.1 — Section Scale 1:1 · mm Section through the reservoir and burner assembly Cross-section showing hatched brass walls, fuel level line, wick channel and thread engagement depth. Ø96.4 ±0.05 88.0 41.2 M24 × 1.5 — 12 deep Fuel line, max fill

Tolerance envelope

General
±0.20 mm
Machined bores
H7 fit
Surface finish
Ra 1.6 µm
Concentricity
0.05 TIR
  1. Hatching indicates material cut by the section plane; adjacent parts hatched at opposing angles.
  2. Thread engagement to be no less than 12 mm at assembly torque of 9 N·m.
  3. Maximum fill line is 41.2 mm above the inner floor — an ullage of 18 % is required for thermal expansion.
  4. Wick channel to run free with 0.4 mm clearance over the full stroke.
Sheet 03

Material schedule

Bill of materials · issue C
HL-2291 / BOM — quantities per finished unit
ItemDescriptionMaterialMass (g)Finish
01Bail handleStainless 316L64Bead blast
02Vented capBrass CZ121148Lacquer
03Borosilicate globeGlass 3.3312Fire polish
04Burner core assemblyNickel / brass96Passivate
05Knurled adjusterBrass CZ12122Satin
06Reservoir bodyDrawn brass402Lacquer
07Cast base plateGunmetal LG2386Shot peen
08Globe seat gasketSilicone 70 Sh8—
Sheet 04

Revision history

Controlled document · do not copy
RevDateChangeBy
A2024-11-04First issue for tooling review.M. Okonjo
B2025-02-18Globe wall increased 2.0 → 2.4 after thermal shock testing.R. Vance
C2025-09-30Base draft angle corrected to 14°; BOM item 08 added.M. Okonjo
D2026-05-12Thread changed to M24 × 1.5; engagement note 7 revised.L. Serrano