The following was extracted from: John J. Griffin & Sons, Ltd. - Baird & Tatlock, Ltd. Scientific Apparatus List No, 60

Pocket Microscope: Provided with nickel-plated draw tube, standard eyepiece, stage and plane mirror. The compound objective gives three powers of magnification from 20 to 200. The instrument is fitted with a removable tripod, the wholes crewing into an oxidized brass case 5 1/2 in. long, 1 1/2 in. diam. Particularly suited for Nature Study