File:SB-12-218-source-1.png

Summary

Description

Dudgeon's sphygmograph, matching the instrument in H. P. Blavatsky's Scrapbooks, volume 12, page 218, item 1. The upright lever, dashed recording-paper path, pen, clamps, wrist strap, dial and hatching match. The book numbers this image Fig. 1; the album and Psyche number the matching instrument Fig. 2. The book is a verified alternate impression, not an established physical source of the album cutting. The red ornament in the magazine is not part of this image.

Source

R. E. Dudgeon, The Sphygmograph: its history and use as an aid to diagnosis in ordinary practice. London: Baillière, Tindall, and Cox, 1882, printed p. 30, Fig. 1. The author, publisher and year were checked on the title page. Dudgeon's authorship of the book does not establish the engraver's identity.

• Wellcome Collection catalogue and specific rights, identifier b21049889, canvas 34.
• Original colour scan.
• Matching magazine impression: Psyche, vol. 21, no. 1, whole no. 493, March 1882, p. 8 / PDF page 12, Fig. 2. The order of publication within 1882 is not established here.

Provided by the Francis A. Countway Library of Medicine, Harvard Medical School, through the Medical Heritage Library, via Wellcome Collection. Thank you to these institutions for freely providing the colour scan and catalogue, and to IAPSOP for the magazine comparison.

Rights

Current specific work statement: Public Domain Mark, verified 4 November 2026. Credit: The sphygmograph : its history and use as an aid to diagnosis in ordinary practice / by R.E. Dudgeon. Public Domain Mark. Source: Wellcome Collection. Changes: cropping only.

File and processing

Lossless RGB PNG, 1970 × 1795 pixels. Input 2293 × 3684; original SHA-256 eec2a1c04c0b29237063ba50976cfaf27adcc53cf1ed480db5edf41937583746. Crop (270, 345)–(2240, 2140), right/bottom exclusive. Printed geometry already aligned; no rotation or resampling of this crop. No enlargement, colourization, tonal adjustment, sharpening, retouching or reconstruction. Original input retained unchanged; final decoded pixels independently reproduced from the documented transform.