USDA Forest Service:
c.1912. Bark beetle infested tree felled with blasting powder. Craggy Mountain Bark Beetle Control Project. California.
USDA Forest Service:
1916. Biltmore scale inscribed on a US log branding axe. Ashland, Oregon.
USDA Forest Service:
1928. Increment borer - determining the age of a tree. Oregon.
USDA Forest Service:
c.1928. Man counting tree rings on a tree core. Oregon.
USDA Forest Service:
1939. Location of minimum recording thermometers on ponderosa pine trees in the 1938-1939 temperature study.
USDA Forest Service:
1940. Enrollee Paul Van Ostrand has become skilled in the use of the pantograph, an instrument which permits the enlargement or reduction of maps to a desired scale. Maps are indispensable wherever the lay of the country must be known.
USDA Forest Service:
1940. Spotting crew. Chewaucan Unit. Fremont National Forest, Oregon
USDA Forest Service:
1941. Gasoline pump used in root washing work. Klamath Basin near Bly, Oregon.
USDA Forest Service:
1946. Aerial photo interpretation technique by Earl J. Rogers. Northeastern Forest Experiment Station, Philadelphia, Pennsylvania.
USDA Forest Service:
1946. View of radial line plotter used in locating sample plots on aerial photos. Northeastern Forest Experiment Station, Philadelphia, Pennsylvania.
USDA Forest Service:
1946. View of radial line plotter used in locating sample plots on aerial photos. Northeastern Forest Experiment Station, Philadelphia, Pennsylvania.
USDA Forest Service:
1947. Walter J. Buckhorn examines screen used to intercept air-borne Douglas-fir tussock moth larvae.
USDA Forest Service:
1948. Stanisol weed spray unit built to extend over an entire bed of seedlings. Hoosier National Forest, Indiana.
USDA Forest Service:
1948. Walter J. Buckhorn shooting a line-gun to mark aerial spray block boundaries. Western spruce budworm control project. Kinzua, Oregon.
USDA Forest Service:
c.1950. Treating felled logs for bark beetles with ethylene dibromide (EDB) insecticide. A heavy concentration is applied with a watering can.
USDA Forest Service:
1950. W.J. Buckhorn demonstrates the first step for recovery of hemlock looper eggs. BEPQ. Portland, Oregon.
USDA Forest Service:
1950. John F. Wear spotting insect-caused tree damage through a strip viewer in a Cessna 195 airplane. Oregon.
USDA Forest Service:
1950. John F. Wear spotting insect-caused tree damage through a strip viewer in a Cessna 195 airplane. Oregon.
USDA Forest Service:
1950. Engelmann spruce bark beetle control project. Worker leading a pack horse loaded with 4 cans of "Goup". Pack stock was used to carry the cans from field dumps out to the work crews. Arapaho National Forest, Colorado.
USDA Forest Service:
1950. Engelmann spruce bark beetle control project. Three-man spray team working in steep terrain in the Elliot Creek Camp work area. Horse packing of "Goop" filled cans was used wherever possible. Arapaho National Forest, Colorado.
USDA Forest Service:
c.1952. Locating disease control areas on a map. Washington.
USDA Forest Service:
1953. Engelmann spruce bark beetle survey. Snowshoes and rigging used by surveyors. Powell Ranger District, Lolo National Forest, Montana.
USDA Forest Service:
1955. Figure 1. A homemade observation mask has proved useful for aerial forest insect detection surveys. It consists of a headgear, such as those used to hold laboratory safety face shields, fitted with a face piece of amber vinylite.
USDA Forest Service:
1955. 5 gallon ice cream containers, equipped with vials, used for forcing western spruce budworm larvae from hibernation to the light. Union field laboratory. Union, Oregon.
USDA Forest Service:
1956. Laboratory set-up for photographing insects in stereo. Shown is the focusing stage and the tilting platform used to produce the two different angles of view. Sellwood Lab. Portland, Oregon.
USDA Forest Service:
c.1957. Walter J. Buckhorn demonstrates sketch-mapping in the cockpit of a Cessna.
USDA Forest Service:
1957. Quart-size ice cream containers used for rearing puparia of Aphidoletes thompsoni, a predator of balsam woolly adelgid (Chermes piceae) that were received from Slovakia, Europe. Sellwood Lab. Portland, Oregon.
USDA Forest Service:
1957. Ice boxes used to transport Aphidoletes thompsoni, a predator of balsam woolly adelgid (Chermes piceae) from Slovakia, Europe, to release points in the field. Sellwood Lab. Portland, Oregon.
USDA Forest Service:
1957. Portable split light table for use in the field, with shoulder-type carrying bag for batteries.
USDA Forest Service:
1958. "Checker's kit." Western spruce budworm control project.
