Horizontal enlargers consist of a lamphouse, condenser, negative carrier, bellows and lens. The holder for the paper is mostly separate. They were popular from the 1880s and still available in the 1930s.

Newman & Guardia produced a number of enlargers both box form and larger folding models. The model shown here was known as the 'N&G Folding Enlarger'. It comprised a folding camera to which a smaller (quarter-plate or 2 ½" x 3 ½") camera was attached. Two forms were made, Model A used a Sibyl (or similar) as the smaller camera, Model B included a smaller bellows camera. The enlarger was intended for daylight use and made in sizes for either whole or half-plate copies. The illustrations in the N&G catalogue (c. 1911) show the smaller camera, holding the negative, to have a simple plate holder, on this example the negative is held in a moveable panel that can be positioned to select part of the negative.

This was produced in two sizes, for the Baby and New Special Sibyl. The Sibyl camera is deployed as the negative holder. The bellows of the enlarger attach to the camera lens. An extension piece fits onto the back of the Sibyl in place of the darkslide, the negative clips to the rear of the extension piece. A ground glass diffuser fits behind the negative and a frame hooks onto the diffuser to which strips of magnesium can be attached. Either daylight or magnesium ribbon could be used as the illuminant.

The Focomat is a very well engineered enlarger introduced in 1934, a little later (c. 1935) a locking lever was incorporated to clamp the masking frame to the baseboard. There are three spring catches around lens holder to switch the auto-focus between formats. The negative number is displayed through a red filter onto the baseboard. The masking frame has adjustable borders.

The Agiscope is very modern (for the time) in styling with extensive use of plastic. It was aimed at those new to enlarging.

The Universal was a developed from the Model 1 introduced in 1945. The head is mounted on a parallelogram movement and is counterbalanced by a weight suspended inside the column. Two sizes of baseboard were available, 16" x 18" and 24" x 24", the smaller size was fitted with a 30" column, the larger with either a 30" or 40" column.