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, continued to use the Gage name until at least 1905.
The Gage swivel-head lathes were offered with swings of 15 and 18 inches in both "engine" forms and also equipped as production models when fitted with turrets.
Standard on many lathes at the time was a method of obtaining an extra fine feed to the carriage, which was achieved by incorporating 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. 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 with one on the power-feed shaft.
From the type and disposition of controls on the apron, the lathe must have been fitted with both power sliding and surfacing feeds.
Very common on wood-turning lathe - but very much less so on ones for metalwork, other swivel-head engineering lathes include the Hardie,  Barker Swivel Head Lathe and Clement
If you have a Gage lathe - or indeed any other swivel-head metal lathe, the writer would be delighted to feature it in the Archive..