36a. Dos microscopios simples de latón. c.1890.

Two simple brass microscopes. c.1890.

This part of the collection is dedicated to magnifying glasses and simple portable microscopes.

Handheld lenses or loupes are also known as pocket loupes. The magnifying lens is mounted on a metal or plastic ring and achieves magnifications of 6 to 10 diameters. The figure shows the combination of glasses that it has to correct aberrations and obtain an image without distortion or color (chromatic aberrations). These loupes can have a diaphragm to regulate the light, with which high quality images are obtained up to 20x magnification. The Perea-Borobio Classical Microscope Collection has the following specimens: Nos. 26, 26a, 29a, 31 and 34.

In the case of simple portable microscopes, they consist of a magnifying glass mounted on a mechanical system that allows a smooth movement of focus. The object or sample to be observed is located on a support or stage that has a central hole. This allows the passage of light rays that are reflected by the mirror located at the base of the device. The magnification is achieved by a single lens system. This is how the first microscopes in our collection are from No. 25 to 27.