He became a well-known maker of optical and mathematical instruments.

He was among Europe's early botanists, and also collected mathematical instruments.

Zelmanov liked to remark that he preferred to make mathematical "instruments" than to use them in practice.

The partners of the company were also referred to as "optical and mathematical instrument" makers.

A mathematical instrument is a tool or device used in the study or practice of mathematics.

He also innovated in the design of mathematical and astronomical instruments.

By 1602, the library had a large cartographic collection and over 150 mathematical instruments.

They sold mathematical, physical and optical instruments, particularly glasses.

We collect instead physical models, mathematical instruments, and the written deliberations of mathematicians.

Other industries had developed by that time to replace it, including the production of mathematical instruments, shoes and cement.