Intended for experiments with small animals or in venous occlusion plethysmography, the bellows are approximately 3 cm long.  It was usually referred to as a recording tambour.

Found in A Text-book of Pharmacology and Some Allied Sciences: (therapeutics, Materia Medica, Pharmacy, Prescription-writing, Toxicology, Etc.), Together with Outlines for Laboratory Work; Solubility and Dose Tables, Etc, by Torald Hermann Sollman, published by W.B. Saunders, 1913, page 815.

“Recording Tambours: The cheapest form consists of a home-made organ-bellow (fig. 113), the sides of very thin leather or gold-beaters skin. A 3 or 4 cm Marey’s tambour answers well.  The 3 cm Brodie Bellows (Made by C.F. Palmer, 6 Upper Tulso Hill, London, N.W.) is the most delicate.  All bear a straw and a writing point about 6 inches long.”