|Name and Model Number||The Mechanical Engineer |
Calculator -- Large Size
|Country of Origin||England, Manchester (distribution). Swiss made.|
|Date of Manufacture||ca. 1900|
|Front Scales||L, A, C (2 circles), S|
|Scale Length||7" (17.6 cm)|
|Type of Rule||Watch Type|
|Construction||Metal case with glass front, rotatable paper scales, and fixed and movable cursors. Scales rotated by main stem and cursor rotated by side stem. (Note: fixed cursor missing on this example.)|
|Area of Use||Generic|
|Comment||Basic mathematical calculations.
Large size version of the calculator. No indication of model name on the scale disc.
Distributed by Scientific Publishing Co., Manchester, England.
|Donor||Collection of Dr. Paul J. Tarantolo Jr.|
(Click Picture for Details)
|In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen|
|(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.|
|• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.|
|• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.|
|• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.|