|Name and Model Number||Maroti Logartabla|
|Country of Origin||Hungary|
|Date of Manufacture||20th Century?|
|Front Scales||2, single cycle scales in sequence, each 13½ sections of 34 cms (13.3″) long. |
Cursor is 14 sections, each 17 cms (6¾″) long
|Back Scales||Instructions in Hungarian|
|Scale Length||2 x 459 cms (2 x 180″)|
|Type of Rule||Other|
|Construction||Steel sheet 36 x 25 cms, and Aluminium sheet cursor 23.5 x 20.5 cms.|
|Area of Use||Generic|
|Comment||Grid Iron - Hungary’s answer to the Hannyngton.
Only example known, this has been mentioned, but not illustrated, In JOS Vol 13; No 1, 2004 page 30.
It is not the easiest of slide rules to use, sliding the sheet cursor over the scales is not particularly
simple to find numbers and then actually using these numbers to perform a calculation is not intuitive.
|Donor||Collection of Peter Hopp|
|RR||= Rare -- 1 of 25 collectors has one; it may take a year to find an example in the marketplace.|
|RRR||= Very rare -- only very few known to collectors; may take several years before one comes up for sale.|
|RRRR||= Extremely rare -- a museum piece; unlikely that an example will ever come up for sale.|