This item is an original vintage Operator's Handbook and Instruction Manual for the Disston Model DO-100 Chain Saw, manufactured by Henry Disston & Sons, Inc. of Philadelphia, Pennsylvania in the early 1950s (circa 1950–1953). Measures 6 X 9 inches in size (15 X 23cm) and is 38 pages in length
The handbook specifically details models equipped with Kiekhaefer Mercury Gasoline Engines, highlighting a historic manufacturing partnership between the legendary saw manufacturer and the iconic marine/motor engine company.
Here is a breakdown of what the provided pages display:
Manual Content & Layout
  • Cover Page: The first image shows a striking red, black, and white mid-century cover design. It displays three configurations of the saw: a standard One-Man straight bar saw, a One-Man Bow Saw (designed to prevent the chain from pinching while cutting brush and logs on the ground), and a Light Convertible configuration alongside a detachable "Helper Handle."
  • Introductory Info & Index (Pages 1–3): The third and fourth images establish the booklet as an operator's tool meant to stay with the chainsaw rather than be filed away. The title page showcases a stylized map of the United States.
  • Controls & Operation (Pages 8–9): The fifth image gives a detailed, labeled diagram of the chainsaw's engine anatomy and operator interface. Key components mapped out include the Magnapull self-rewinding starter, fuel mixture control, throttle lock, stop button, auxiliary priming valve, and the clutch safety catch.
  • Starter Servicing (Pages 22–23): The sixth image provides technical, step-by-step instructions for performing mechanical maintenance on the recoil starter mechanism, including how to separate the sheave from the housing, replace the starter cable, and safely install the high-tension starter spring.
  • Attachments & Cutting Techniques (Pages 32–34): The seventh and eighth images describe specialized usage. It details different rail attachments, including a "Light Convertible Grooved Rail," and illustrates "Bore-Bucking"—a highly technical plunge-cutting logging technique used to systematically cut through logs under tension without splitting the wood or trapping the blade.
  • Technical Specifications (Page 35): The final page outlines the precise engineering metrics of the engine:
    • Engine Type: Mercury single-cylinder, two-cycle, air-cooled gas engine
    • Performance: 3½ Horsepower at 4000 RPM
    • Engine Specs: 2-inch bore, 1¾-inch stroke, and a 5.5 cubic inch piston displacement
    • Fuel Mixture: A ratio of 1 part SAE-30 oil to 16 parts gasoline (3½ pints of fuel capacity)