radar performance calculator slide chart
DateCopyright 1962
Inventory Number2004-1-0019
ClassificationSlide Rule
Subject
Maker
Perrygraf
founded 1934
Maker
Raytheon Manufacturing Company
founded 1925
Owner
Charles Grover Smith
?
1888 - 1969
Cultural Region
Place of Origin
Dimensions0.3 × 25.4 × 11.4 cm (1/8 × 10 × 4 1/2 in.)
in sheath: 0.4 × 26.3 × 12.8 cm (3/16 × 10 3/8 × 5 1/16 in.)
in sheath: 0.4 × 26.3 × 12.8 cm (3/16 × 10 3/8 × 5 1/16 in.)
Material
Bibliography
DescriptionClear plastic rule with 5 horizontal cardboard slides, each with separate scales. in paper sheath.
On one side, the five corresponding lines are marked A-E, while on the opposite side they are marked 1-5.
A(bottom): Re, Effective Range, -NM. logarithmic scale 1-1000. This is a fixed scale on the plastic frame.
B(top): V, Closing velocity, ft/sec. logarithmic scale 20-10.000
B(bottom): Tf, Frame Time, seconds. inverse logarithmic scale, 100-0.05
C(top): Operator Factor. Inverse logarithmic scale 1.0 - 0.05
D(top): [Rho], Range Correction Factor. logarithmic scale 0.4-1.6. This is a fixed scale on the plastic frame.
D(bottom): [Rho], Two scales: On the left, Range Correction Factor. logarithmic 0.4 - 1.6; On the right, Single Look Probability %. inverse logarithmic 100-0. These are fixed scales on the plastic frame.
E(top): Detection Range, NM. logarithmic scale, 5-500.
E(bottom): Semi-Active Range, NM. inverse logarithmic scale 100-1. This is a fixed scale on the plastic frame.
top edge: False Alarm Probability. Inverse
1(top): PT, Transmitter Peak Power. Inverse logarithmic scale, 100MW to 1W.
1(bottom): GT, Transmit Antenna Gain, dB. Linear scale 0-50.
2(top): GR Receive Atenna Gain, dB. linear scale 50-0.
2(bottom): d Transmitter Duty Cycle. Logarithmic scale, 0.001 - 1
3(top): [lambda] Wave Length, cm. inverse logarithmic scale, 1000 - 0.1
3(bottom): F Noise Figure - dB. linear scale, 30 to -20.
4(top): L System Loss -dB. Linear scale, 0-20
4(bottom): Time on Target -sec. logarithmic scale, 10^-7 to 10
5(top): Two scales. Left: PRF(pps) or Predetection Bandwidth (cps). inverse logarithmic scale 10.000 - 1; Right: n - Number of Pulses Integrated. logarithmic scale 1 - 5000
5(bottom): [sigma] Target Cross Section, Sq.Meters. logarithmic scale 0.01 - 10.000
bottom edge: R Range NM. logarithmic scale, 5 - 500.
On one side, the five corresponding lines are marked A-E, while on the opposite side they are marked 1-5.
A(bottom): Re, Effective Range, -NM. logarithmic scale 1-1000. This is a fixed scale on the plastic frame.
B(top): V, Closing velocity, ft/sec. logarithmic scale 20-10.000
B(bottom): Tf, Frame Time, seconds. inverse logarithmic scale, 100-0.05
C(top): Operator Factor. Inverse logarithmic scale 1.0 - 0.05
D(top): [Rho], Range Correction Factor. logarithmic scale 0.4-1.6. This is a fixed scale on the plastic frame.
D(bottom): [Rho], Two scales: On the left, Range Correction Factor. logarithmic 0.4 - 1.6; On the right, Single Look Probability %. inverse logarithmic 100-0. These are fixed scales on the plastic frame.
E(top): Detection Range, NM. logarithmic scale, 5-500.
E(bottom): Semi-Active Range, NM. inverse logarithmic scale 100-1. This is a fixed scale on the plastic frame.
top edge: False Alarm Probability. Inverse
1(top): PT, Transmitter Peak Power. Inverse logarithmic scale, 100MW to 1W.
1(bottom): GT, Transmit Antenna Gain, dB. Linear scale 0-50.
2(top): GR Receive Atenna Gain, dB. linear scale 50-0.
2(bottom): d Transmitter Duty Cycle. Logarithmic scale, 0.001 - 1
3(top): [lambda] Wave Length, cm. inverse logarithmic scale, 1000 - 0.1
3(bottom): F Noise Figure - dB. linear scale, 30 to -20.
4(top): L System Loss -dB. Linear scale, 0-20
4(bottom): Time on Target -sec. logarithmic scale, 10^-7 to 10
5(top): Two scales. Left: PRF(pps) or Predetection Bandwidth (cps). inverse logarithmic scale 10.000 - 1; Right: n - Number of Pulses Integrated. logarithmic scale 1 - 5000
5(bottom): [sigma] Target Cross Section, Sq.Meters. logarithmic scale 0.01 - 10.000
bottom edge: R Range NM. logarithmic scale, 5 - 500.
Signedon front of rule, top: RAYTHEON RADAR PERFORMANCE CALCULATOR;
on front of rule, bottom right: Raythen Company 1962 - All rights reserved;
on back of rule, bottom: RAYTHEON COMPANY . Lexington 73, Massachusetts;
on back of rule, bottom right: Slide Chart by PERRYGRAF, Maywood, Ill.;
on front of paper sheath: Radar / Performance / Calculator;
on back of paper sheath, sideways: Radar Performance Calculator;
on back of paper sheath, lower right: RAYTHEON COMPANY . Lexington 73, Massachusetts / (C) Raytheon Company - All Rights Reserved;
Curatorial RemarksAlthough its date and provenance indicates that this rule was owned by C.G. Smith, there was at least one slide rule in his papers too recent to have been owned by him.
FunctionTo calculate different paramenters related to the use of radar depending on variables such as wavelength, transmitting power, antenna specs, as well as distance, speed and size of detected objects etc.
Slide rules made by Raytheon were used internally, and also distributed to the outside for promotional purposes.
Slide rules made by Raytheon were used internally, and also distributed to the outside for promotional purposes.
ProvenanceFound with C.G. Smith's papers, 2.20.2004.
His papers are in the Collection of Historical Scientific Instruments, Harvard University. Reference Number Lib.4586.
Raytheon Manufacturing Company
Date: Copyright 1966
Accessories: sheath
Object number: 2004-1-0016
Arlton Workshop
Date: copyright 1960
Accessories: stored in plastic bag
Object number: 1998-1-1348
Raytheon Manufacturing Company
Date: Copyright 1986
Accessories: one of two identical guides: 2004-1-0017a,b
Object number: 2004-1-0017a
Raytheon Manufacturing Company
Date: circa 1986
Accessories: one of two identical guides: 2004-1-0017a,b
Object number: 2004-1-0017b
Pickett & Eckel, Inc.
Date: copyright 1959
Accessories: brown leather case with hard plastic lining and flap closure; small plastic bag; Twin Pack box; 3 instruction manuals (in file); belt loop (1991-4-0004b); pocket slide rule (1991-4-0004c); cardboard box
Object number: 1991-4-0004a
Keuffel & Esser Company
Date: copyright 1961
Accessories: brown leather case with metal-reinforced flap closure
Object number: 2003-1-0191
Keuffel & Esser Company
Date: copyright 1961
Accessories: Brown leather case with metal-reinforced flap closure, for storage.
Object number: 1995-1-0024
Keuffel & Esser Company
Date: dated 1943
Accessories: instruction book and black leather case with flap closure, for storage
Object number: 1990-5-0004
Keuffel & Esser Company
Date: circa 1943
Accessories: black leather case with flap closure
Object number: 1995-1-0023
Cast Iron Pipe Research Association
Date: copyright 1967
Accessories: envelope; folder containing instruction booklet
Object number: 1997-1-1624
Keuffel & Esser Company
Date: circa 1956
Accessories: brown leather case with metal-reinforced flap closure
Object number: 1995-1-0025