40 is the COEN COMPANY SWING DESIGN NAT- URAL DRAFT FIRING FRONT for installation under Watertube (or Scotch) boilers. This type of Oil Burning Front is giving vessel owners more than 80% BOILER EFFI- CIENCY over a 100% load range, without changing burn- er tips. COEN COMPANY, Inc. SAN FRANCISCO LOS ANGELES NEW YORK 112 Market St. 428 Story Bldg. 50 Church St. MARINE REVIEW—April, 1927