altimeter
Datecirca 1940
Inventory Number2004-1-0359
ClassificationAltimeter
Subject
Maker
Kollsman Instrument Company
1928-present
Cultural Region
Place of Origin
Dimensions9.3 × 8.2 × 13 cm (3 11/16 × 3 1/4 × 5 1/8 in.)
Material
DescriptionCylindrical altimeter consisting of an aneroid barometer housed in a black circular case, with a glass face over the scale. The scale runs from 0-9, and has two pointers, one longer and one shorter. A small window to the right side of the face also gives a numerical reading.
For a complete technical information, read the 1936 patent here.
For a complete technical information, read the 1936 patent here.
Signedon back plaque: KOLLSMAN INSTRUMENT COMPANY INC. / BROOKLYN NEW YORK
Inscribedon plaque: Contract No. W535 AC-9064 / MFR's Part No. 325-03 / Spec. No. 94-27758 / MANUFACTURED UNDER U.S. PATENTS / 1,930,899 2,034,909 U.S. REISSUE / PATENTS 18, 808, [damaged], 079 FOREIGN / PATENTS OTHER PATENTS PENDING / KOLLSMAN INSTRUMENT COMPANY INC. / BROOKLYN NEW YORK
on face: 1000 feet / 10000 feet / ALTITUDE
scale runs from 0-9, clockwise
FunctionSimilar to a basic aneroid barometer, this instrument uses a relatively large partially evacuated metal chamber, which is sensitive to small changes in atmospheric pressure. The minute contractions and expansions of the chamber are amplified by internal clockwork, and reflected on the dial. Falling atmospheric pressure translates to an ascending condition, while increasing atmospheric pressure translates to a descending condition. This chamber is placed inside a closed box, and can be exposed to the atmosphere via the small metal tap that protrudes from the front of the case.
American Paulin System
Date: 1910-1940
Accessories: original cardboard box
Object number: 1996-1-0052
American Paulin System
Date: 1910-1940
Accessories: original cardboard box
Object number: 1996-1-0051
C. E. Johansson Ltd
Date: 1910-1930
Accessories: leather carrying case with strap
Object number: 1996-1-0048
Conner Peripherals
Date: 1994
Accessories: black plastic case
Object number: 1998-1-0788
Eastman Kodak Company
Date: 1940-1950
Accessories: leather-lined carrying case; filters(3); filter holder
Object number: 2000-1-0018
Scientific Shop
Date: circa 1900
Accessories: dove-tailed wooden box with leather handle and lock with key; two cardboard box es of labeled Kromograms; 12.9 cm x 25.2 cm x .2 cm piece of frosted glass with wood frame on two sides and small metal chain with a loop at the end attached to top piece of wood framing.
Object number: 1997-1-1463
Western Electric Company
Date: circa 1920
Accessories: cover
Object number: 1997-1-0579