George Gage (1804 -1892) advertised his swivel-head lathes from as early as 1871. According to Kenneth Cope's comprehensive book "American Lathe Builders" in about 1850 the Company operated as Gage & Campbell - but the sole owner remained Mr Gage (was Mr Campbell perhaps a silent partner, investing in the Company's expansion?). In 1888 the business was turned over to his son, John E. Gage, who operated it until selling out in 1896 - the new owners, Snyder & Metcalf using the Gage name until at least 1905. The swivel-head lathes were offered with swings of 15 and 18 inches in both "engine" form and also equipped as production models when fitted with turrets.
Common on many lathes at the time was a method of obtaining an extra fine feed to the carriage, this being achieved by the incorporation of a supplementary fine-feed drive by a 3-step flat belt attached to a separate power shaft. The drive for this - the pulley can be seen below the tool table-support casting -   must have been taken from the bevel shaft. In addition, screwcutting must too have been driven in this way - the changewheels having no connection to the headstock spindle - an interesting set-up indeed. Besides the "direct-drive" belt feed to the power shaft, a slower more positive feed appears to have been possible by meshing a gear on the leadscrew to one on the power-feed shaft.
From the type and disposition of controls on the apron, the lathe appears to have been fitted with both power sliding and surfacing feeds.
If you have a Gage lathe, the writer would be delighted to feature it in the Archive