Accession No

6049

Brief Description

white painted, wooden antenna slide rule, by Lawrence Engineering Service, U.S.A., 1945

Origin

U.S.A.; Indiana; Peru

Maker

Lawrence Engineering Service

Class

calculating; military

Earliest Date

1945

Latest Date

1945

Inscription Date

Material

wood; metal; plastic

Dimensions

length 268mm; width 28mm; depth 10mm

Special Collection

Provenance

Donated on or before 07/07/2005. Owned by Dr L.W. Brown, Head Engineer at the Radar Development Department at MIT gave it to the donor in the mid-1950s.

Inscription

‘RSC CONFIDENTIAL ANTENNA SLIDE RULE CONFIDENTIAL RSC
RADIATION LABORATORY M.I.T,CAMBRIDGE ,MASS.’

Description Notes

White painted, wooden slide rule, by Lawrence Engineering Service, USA, 1945. Painted white on obverse, with metal and plastic cursor.

The top carries two scales. The first labelled ‘FULL WIDTHS’ marked with arrows at ‘λ/2D’ and ‘λ/D‘ between these is a box marked ‘H .8P E’ and after the second is another box ‘H .5P E’ which has an arrow pointing to the right end of it marked ‘G’. Three additional points have been marked with a pen. The second scale labelled ‘SIDE LOBE MAX’ has two arrows marked ‘1st’ ‘2nd’ and two additional arrows marked in pen.

The next scales are labelled ‘ANGLE’, ‘θ’, numbered .2°, .3, .4, .5, .6, .8, 1°, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 40, 50, 60, 90, and subdivided; labelled ‘GAIN’, ‘G’ numbered 80, 60, 40, 30, 20x104, 10, 6, 4, 3, 2x104, 10,000, 6,000, 4,000, 2,000, 1,000, 600, 400, 300, 200, 100, 80, 60, 40, 30, 20, 10, and subdivided; labelled ‘WAVELENGTH’, ‘λ’, numbered .4, .5, .6, .8, 1CM, 2, 3, 4, 5, 6, 8, 10CM, 20, 30, 40, 50, 60, 80, 100, and subdivided, labelled with an arrow ‘D/λ’ at approx 2.54

The bottom scale is labelled the ‘DIAMETER’, ‘D’, numbered 4”, 6, 8, 10, 12”, 14, 16, 18, 20, 24, 30, 36, 40, 48, 60, 72, 96, 120, 144” and 1’, 2, 3, 4, 5, 6, 7, 8, 10, 12’, 14, 16, 18, 20, 25, 30, 40, 50, and subdivided.

Reverse side is plain.

Condition: fair; complete

References

Events