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Calculating Instruments > Slide rules

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Concrete Volume Computer - Imperial and Metric Units, 1970 - 1980
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Object statement
Promotional slide rule, Concrete Volume, plastic / cardboard, made by Blundell Harling Ltd, England, 1970-1980
This slide rule is from the collection of calculating instruments assembled by Assoc. Professor Allan Bromley. His collection provides examples of most forms of calculating devices made from the early 18th to the late 20th centuries. Slide rules constitute a substantial proportion of this collection.

Over the 19th and much of the 20th centuries the slide rule was the primary instrument for calculation used by many people engaged in the trades and in engineering. Although originally invented in the 17th century, and widely used for gauging (or estimating the quantities of certain products such as alcoholic spirits) it took until around 1850 for the slide rule to become generally popular. However for those engaged in estimating (ie, gauging) various quantities of goods in use in the liquor, building and agriculture trades, and for calculating the excise duty to be paid on these goods, numerous kinds of sliding rules with useful scales were developed.

Specialist slide rules of many kinds were developed over the period of their use. In the 20th century many special purpose slide rules were made from various kinds of paper or card, and from light sheet plastics once plastics became a common place in the later part of the century. Generally known as Perrygrafs after the Perry Graf Corp of Maywood Illinois, [Johns] who made slide charts and rules and other speciality items for marketing purposes, they were commonly made as promotional devices while retaining some functional value.

This slide rule was designed to assist in the calculation of the volume of cement to be used in concretes of particular mix proportions. It uses Imperial units on one side and Metric units on the other and must have been made about the time of the changeover from Imperial units to Metric units in Australia. Given the length and width of an area and the depth of the concrete slab, the volume of concrete in cubic yards or cubic metres can be calculated. It was made for Australian Blue Metal (Darwin) as a promotional item.

Stephen Jones
April 2008
Made for Australian Blue Metal (Darwin), A Division of Readymix Group, S.A.
Supplied by Australian Data Converters (Adelaide). Mfr'd by Blundell Harling Ltd, Weymouth, England.
Australian Blue Metal was established by the O'Neill family of Perth to quarry basalt in the early 1950s. They were taken over by Readymix in 1957 who were subsequently engaged in the sealing of the highway across the Nullarbor. Readymix later became a subsidiary of CSR Ltd.

 This text content licensed under CC BY-NC.

Description
Slide rule, Concrete Volume, plastic folded wrapper around sliding plastic card. Except some transparent spaces on the wrapper (allowed to be read through), the rest of wrapper is printed in orange with scales and text printed in black. The sliding card is white with scales printed in black.

With scales for Depth, Width, Length and Volume.
Instructions: Set width or height against depth (or thickness) and read off volume against length.
Made: 1970 - 1980

Owned: 1978 - 2002
Marks
Name on observe, in centre, printed in black ' Concrete Volume Computer - Imperial Units '. White paper label in upper right, handwriten in blacl pen ' Bromley / 1983-164 '.

Name and notes on reverse, in centre, printed in black ' Concrete Volume Computer - Metric Units ', in upper right ' With the compliments of / Australian Blue Metal (Darwin.) / A division of the Readymix Group (S.A.) / Phone Concrete 3648 Bule Metal 3464. Office 6300. '.

Manufacturer on inner sliding card, in upper right, printed in black ' S 121P / Copyright 1970 / Blundell Harling Ltd, Weymouth, Engliand. '.
2010/1/481
Production date
1970 - 1980
Width
46 mm
Depth
3 mm

 This text content licensed under CC BY-SA.
Acquisition credit line
Donated through the Australian Government Cultural Gifts Program in memory of Associate Professor Allan Bromley, 2010
Subjects
+ Mathematics
Short persistent URL
Concise link back to this object: http://from.ph/381638
Cite this object in Wikipedia
Copy and paste this wiki-markup:

{{cite web |url=http://from.ph/381638 |title=Concrete Volume Computer - Imperial and Metric Units |author=Powerhouse Museum |accessdate=31 October 2014 |publisher=Powerhouse Museum, Australia}}


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Object viewed 2208 times. Parent IRN: 1818. Master IRN: 1818 Img: 310212 Flv: H:1801px W:4650px SMO:0 RIGHTS:.