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Blundell-Harling Ltd.

B.R.L
BLUNDELL RULES LIMITED








go right to the catalog! Skip the INTRO, Go RIGHT to the Archive!

* The various incarnations of Blundell Rules Limited (BRL) originated in Luton in the UK as an effort to create ongoing post-war work for a machine shop created during WW2. They later moved to Weymouth in the UK in January of 1956 and refined their rule making techniques, with the British government as a prime customer. In January of 1964, BRL purchased the assets of W.H. Harling Limited of Clapton, London, and with it, a line of precision drawing instruments, T-squares and related items (Harling had previously made wooden slide rules, but dropped them in favor of its other instruments). The resulting company became Blundell-Harling, and stayed in Weymouth.

* The 1970's saw the decline of slide rule revenues, and the company, like many others, focused on other areas including various metric converters to aid in the national change to the metric system, boat navigation aids (still in production) and drafting and drawing materials. Some perrygrafs, slide charts, specialty slide rules and special graphical calculator designs are still made for the government, medical and industrial customers, and the company still exists and is operating today in the UK.

* Unlike other makers, BRL or BH focused mainly on synthetic materials construction right from the beginning, starting with Bakelite, then moving quickly to plastic (PVC-Polyvinyl Chloride) rule construction (US Geon and German Astralon, then Cobex and Darvic). There are a few early metal framed glass cursors, but most are made from Acrylic materials.

* Early rules are marked B.R.L for Blundell Rules Limited.
Later rules are marked BLUNDELL.

* Their rules, even early ones, are very distinctive in design, and have some strong visual features like the bright yellow accent stripes on the 800 series. They also produced a rule of considerable interest to collectors, the elusive and seldom seen 'Pilot Balloon Rule'. This large rule has a very unique assortment of scales and cursors to compute the flight behavior of atmospheric 'pilot' balloons for the British government's weather services. From the name, I first thought it was an ancient rule for navigating a lighter-than-air ship, imagine my disappointment....plotting un-manned weather balloons. Sigh.

Special THANKS to Ray Hems for the original catalog data, and to the Oughtred Society Journal (Spring 1998) article by Peter Soole for historical information on Blundell.

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The ARCHIVE will appear below shortly!

ARCHIVE: JUST SCROLL DOWN TO SEE EVERYTHING !down
ORIGINAL Blundell-Harling Catalog Pages:
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Rulers
and
Scales
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Rulers
and
Scales
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Rulers
and
Scales
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Slide
Rules
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Slide
Rules
and
Charts
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B.R.L

Blundell Rules Ltd.
Military Rules

MODEL
INFO / SCALES
IMAGE
B.R.L

Blundell Rules Ltd.
Radiac No. 1
6665-110060
6665-110117


Made in England
Radiation Effects Rule
Radiac No. 1


UK military radiation effects rule, computes radiation dosage over land or sea (disks are removable and can be flipped over for alternate scenarios (blue/water, pink/land).


The set includes the rule with changeable disks, and the carry pouch, both are new, perfect condition. Full instructions are on the rule reverse side.

Interestingly, while it allows you to elegantly compute your radiatioon dosage, it does not say how much is fatal. An unfortunate oversight, if you should happen to really need this rule.
Land Face, CLICK for bigger PIC!
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Sea Face, CLICK for bigger PIC!
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B.R.L

Blundell Rules Ltd.
Commercial Rules

Blundell Rule Limited
Model Number
Slide Rule Type Size,
Core Material
Scales
Features
IMAGE
LINKS
(Browser Back to Return)
604
Made in England
Electro 5"

White Plastic

Inch ruler UL, A, [ B, CI, C, ] D, LL

unknown

Simple Simplex indicator,

Leather slip case

CLICK for bigger PIC!
606
Made in England
Basic 5"

White Plastic

Inch ruler A, [ B, CI, C, ] D

unknown

Simple Simplex indicator,

Leather slip case

AL6
Made in England
AL6 10"

White Plastic

Inch ruler UL, A, [ B, R, C, ] D, LL

[ S, ST, T ] cm ruler

3-Line Simplex indicator, metal framed, 2 rear stationary cursor lines

Black fabric covered hinged 2-part wood case

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CLICK for bigger PIC!
P.17
Made in England
P.17 5"

White Plastic

Inch ruler UL, A, [ B, R, C, ] D, LL

[ S, ST, T ] cm ruler

Simple Simplex indicator, metal framed, 2 rear stationary cursor lines

Leather slip case

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Blundell Harling Ltd. Rules
Commercial Rules

Blundell-Harling
Model Number
Slide Rule Type Size,
Core Material
Scales
Features
IMAGE
LINKS
(Browser Back to Return)
800
Made in England
Basic 10"

White Plastic, yellow highlights

A, [ B, C, ] D

-BLANK-

Simple Simplex indicator

2-Part Blue Plastic Case

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803
Made in England
Rietz 10"

White Plastic, yellow highlights

L, K, A, [ B, CI, C, ] D, S, T, ST

-BLANK-

3-Line Simplex indicator

2-Part Blue Plastic Case

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804
Made in England
Darmstadt 10"

White Plastic, yellow highlights

L, K, A, [ B, CI, C, ] D, P, S, T

[ LL1, LL2, LL3 ]

4-Line Simplex indicator, 2 stationary rear cursor lines.

2-Part Blue Plastic Case

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808
Made in England
Accounting 10"

White Plastic, yellow highlights

S, LL1, DF, [ CF, Uplift/Discount%, C, ] D, LL3, LL2

Month, [ Day, Week ]

Simple Simplex indicator.

2-Part Blue Plastic Case

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CLICK for bigger PIC!
813
Made in England
Rietz
Classmate
10"

White Plastic

S, T, A, [ B, CI, C, ] D, K, L

3-Line Simplex indicator.

2-Part Blue Plastic Case

CLICK for Bigger Pic!
904
Made in England
Academy Duplex 10"

White Plastic

ST, A, [ B, CI, C, ] D, S, T

K, L, DF, [ CF, CIF, C, ] D, LL2, L3

1/3-Line Duplex indicator.

Vinyl Slip Case

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CLICK for bigger PIC!
905
Made in England
Academy Duplex 10"

White Plastic

LL01, LL02, Ll03, A, [ B, L, CI, C, ] D, LL3, LL2, LL1

K, P, ST, DF, [ CF, CIF, CI, C, ] D, T, S

1/3-Line Duplex indicator.

2-Part Blue Plastic Case

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Pilot
Balloon
Rule

Made in England
Mark 5 24"

White Plastic

Log, Cosine, Sine, Azimuth, [ Graticule (2) ] Elevation-Secant, Tangent

-Blank-

4 Simplex indicators

Finished wooden hinged 2-part case

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Yet Another View!
S143-10
Made in England
S143-10 10"

White Plastic

K, A, [ B, CI, C, ] D, L

-Blank-

3-Line Simplex indicator

Vinyl bag + short form instructions

CLICK for Bigger PIC!
S150-10
Made in England
S150-10 10"

White Plastic

S, T, A, [ B, CI, C, ] D, K, L

-Blank-

3-Line Simplex indicator

Vinyl bag + short form instructions

CLICK for Bigger PIC!
S150-20
Made in England
S150-20 5"

White Plastic

S, T, A, [ B, CI, C, ] D, K, L

-Blank-

3-Line Simplex indicator

Vinyl bag + short form instructions

CLICK for bigger PIC!

Later 0400 Catalog Numbers CLICK IMAGE to enlarge
Rulers
and
Slide
Rules
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