5" Bone & Wood Surveyor? Slide Rule Kolesch & Co. NY

Here is a fantastic pocket slide rule (surveyor's?) made by Kolesch & Co. NY. It is made of bone and what appears to be mahogany. It is in very nice used condition with slight damage to the wood in some spots which is not very noticable without close inspection (please study the photos). Attached to the bone bottom piece is a paper label that provides various measurements associated with substance strength and weight. Regarding strength, the substances include cast iron, wrought iron, steel, oak and white pine. Regarding weight, the substances include cement, earth, gravel sand, lead, masonry, and water pure.

This is a great looking piece, my guess, quite rare, that I am certain will be a wonderful addition to your collection.

Thanks for looking and please ask questions.