Felsenthal High Angle Firing Table

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Description
The U.S. Army used this wooden high-angle firing table when positioning 155 mm howitzer guns firing high-energy shells. The instrument has a white coating on both sides. A yellowed plastic indicator has wooden edges that are held together with brass rivets. The top edge of one side has scales for 100 yards and for range. This side also has three sets of scales for elevation, 10MSI, drift, and TF (target firing?). The sets of scales cover the use of M1 propellant with a muzzle velocity (MV) of 2,100; M1 propellant with MV 2,800; and M1917 propellant with MV 2,370. The left end is marked: 29105 (/) FT 155-S-2 C7 RULE No. 1. The right end is marked: HIGH ANGLE (/) GUN, 155MM. SHELL, H.E., M101 (/) M1 & M1A1 FUZE, M51.
The other side has scales for 100 yards and range along both long edges. The center of the rule has two sets of scales, both for elevation, fuze, drift, and fuze settings of M55 and M67 with M1 propellant. These sets of scales are marked with the letter N. The left end is marked: 29105 (/) FT 155-S-2 C7 RULE No 1. The right end is marked: GUN, 155 MM. SH. H.E., M101 (/) M1 & M1A1 FUZE, M51, M55, M67.
The Felsenthal Instrument Company of Chicago made these artillery rules for distribution by the bookstore at Fort Sill, Okla., from World War II through the Vietnam War. For other instruments used to position howitzers, see 1977.1141.25, 1977.1141.26, 1977.1141.27, and 2005.0271.02. For Felsenthal company history, see 1977.1141.01 and 1977.1141.02.
References: "Graphical Site Table," The Field Artillery Journal 35, no. 9 (September 1945): 548; accession file.
Location
Currently not on view
date made
ca 1960
maker
Felsenthal Instrument Co.
place made
United States: Oklahoma, Fort Sill
Physical Description
wood (overall material)
plastic (overall material)
paper (overall material)
brass (overall material)
Measurements
overall: 1.1 cm x 29.4 cm x 6.8 cm; 7/16 in x 11 9/16 in x 2 11/16 in
ID Number
1977.1141.28
catalog number
336412
accession number
1977.1141
Credit Line
Gift of Ben Wharton Rau and Margery Felsenthal Rau
subject
Mathematics
Artillery
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Scale Rules
Data Source
National Museum of American History, Kenneth E. Behring Center

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