|Name and Model Number||Lord's Calculator|
|Country of Origin||England|
|Date of Manufacture|
|Front Scales||D [C][B] A|
|Scale Length||7.0 cm diameter|
|Type of Rule||Watch Type|
|Construction||Nickel plated brass|
|Area of Use||Generic|
|Comment||Manufactured by R. Waddington.
Used for weaving.
|Donor||Collection of Rod Lovett|
|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.|