Microscope Museum

Collection of antique microscopes and other scientific instruments

Microscope 594 (Salanson & Co; drum microscope; late 19^th - early 20^th century)

Microscope 594 is a simple drum microscope and should be dated to the late 19^th or early 20^th century. The original wooden box of the instrument contains a label with the inscription “FROM SALANSON & CO., Opticians and Electricians, HIGH STREET, BRISTOL & CARDIFF”. H. Salanson & Co was established around 1887 by Alfred Salanson and listed at 21 Clare Street and 130 Victoria Street and, in 1901, 20 High Street in Bristol. The company also had premisses at Queen Street in Cardiff. Over the following forty years the company sold optical instruments, microscopes, spectacles, cameras, and photographic equipment, among other instruments. Drum microscopes were apparently invented by German makers in the early 1700's. However, it was Benjamin Martin who, in about 1738, introduced a format that became most popularized. Benjamin’s name became associated with these types of microscopes, and they are to this day often still referred to as 'Martin type' or ‘Martin drum’ microscopes. Simple versions of the Martin type microscope were sold in large numbers during the second half of the 19^th century and early 20^th century, mainly with a French origin. The most common models, also with the lowest quality, especially when sold in the 20^th century, were models like the ones illustrated in Figure 1 and the same microscopes with the addition of a bullseye condenser (Figure 2). However, other versions of drum microscopes were available from different makers and retailers (Figure 3). The original forms of drum microscopes had a sliding coarse focus, although some versions had a rack and pinion focussing mechanism. The stage of the basic drum microscope models allowed limited access and movement to microscope slides, but some models had less obtrusive designs such as an opening access to the stage from two sides (Figure 3), or the use of a thin pillar to support the body tube rather than using an extension of the basic outer tube housing upwards. Most drum microscopes were sold with a single objective, but often the French objectives were divisible and sometimes extra objectives and other accessories were supplied. Some drum microscope models allowed for inclination (Figure 3B). The earlier versions of drum microscopes were sold in heavy hardwood boxes, but the later, especially twentieth century models, were often sold in lower quality and thin pine boxes. While some of these toy drum microscopes were being sold, more substantial and complete models that could be used for more serious work were also available. These included examples made by makers such as Nachet, Oberhauser, Hartnack and by some English makers through much of the 19^th century, though less commonly as the century progressed. Figure 4 illustrates an example of a Large Improved Compound Microscope. These drum microscopes are relatively common and date from the early to mid-19^th century. Some instruments are signed by a retailer, while others are unsigned. Most likely these microscopes were made for the trade and not necessarily by the firm identified by the signature. Versions of these instruments were produced with and without the rack and pinion focusing mechanism.

Figure 1. Several versions of drum microscopes sold during the second half of the 19^th century as engraved in antique catalogues of different makers and retailers: (A) Spencer Browning & Co (1857); (B) Negretti & Zambra (1859, 1870s and 1885); (C) William McAllister (1867); (D, E) James Queen (1870 and 1872); (F) Miller Bros (1879); (G) R & J Beck (1882); James Queen & Co (1890).

Figure 2. Several versions of drum microscopes as in Figure 1 but including an bullseye lens, sold during the second half of the 19^th century as engraved in antique catalogues of different makers and retailers: (A) Spencer Browning & Co (1857); (B) Negretti & Zambra (1859); (C) F & J Amadio (1864); (D) William McAllister (1867); (E) James Queen (1870); (F) James Queen (1870 and 1872); (G, H) Negretti & Zambra (1870s, 1885); (I) Miller Bros (1879).

Figure 3. Different versions of drum microscopes as engraved in an antique catalogue of B Kahn & Son (c. 1890).

Figure 4. An engraving of the English Large Improved Compound Microscope as shown in the 1848 Pike's Illustrated Descriptive Catalogue of Optical, Mathematical and Philosophical Instruments.