Item - Vintage Calculator, Trufood Infant Weight/Obstetric Calculator, Circa 1960s; used to work out expected date of delivery and growth rate of the baby. The Double Sided Rectangular Slide Rule is made from two pieces of plastic (celluloid) with a central metal rivet, allowing the central round disks to rotate within the rectangular. The Calculator was produced for Trufood as a give away to professionals (midwifes, etc....); Trufood went on to amalgamate with Cow & Gate in the early 1970s.
Maker - Unknown; but produced for Trufood Limited of Green Bank, London, E.1.
Circa - 1950s
Construction - Plastic
Country of Origin - Not Marked but believe to be English
Dimensions - 4" by 2.75"
Weight - 6 gram
Condition - Excellent Used Condition
Other Interesting Points - This particular slide rule is double sided with the scales as follows -
Side One - Dial System to work out babies expected delivery date from first day of last period.
Side Two - Dial System to work out babies expected growth rate
Note regarding the pictures - Depending on your screen the slide rule may appear to look a little yellow but it is in fact the pictures.....the slide rule is more of a white/ivorine colour.....
(Please see all Photos).
POSTAGE & PACKAGING
There is a charge of £1.00 for Postage and Packaging to all U.K. Residents (1st Class Mail Delivery, others P.O.A), we will also ship Worldwide please check table table below. If you have any questions please feel free to contact!
Postage Rates for this Item
| Special Next Day Delivery |
£5.00 |
| 1st Class Recorded Mail |
£2.00 |
| 1st Class Mail |
£1.00 |
| Air Mail Europe |
£1.50 |
| Air Mail Outside Europe |
£2.00 |
