JASON P. SPRINGER
San Francisco an Illustrated Review
of it's Progress and Importance
January, 1887
pg. 84

Jason Springer & Co., Manufacturers and Dealers in Sugar Pine, Doors, windows, Sashes, Blinds, Lumber, etc., Factory and Offices, Southeast corner of Spear and Mission streets. Of the many industrial enterprises in San Francisco that have been instrumental in building up the general prosperity now enjoyed that of Jason Springer & Co. is most worthy of liberal mention in this volume. Within the past decade machinery adapted for woodwork has been so improved that there is now hardly any limit to the range of operations performed by this wonderful class of time and labor-saving inventions, and in no branch has there been noted such remarkable improvements as are identified with the machinery used in the manufacture of the line of productions represented by this widely-known establishment. The enterprise was inaugurated about twenty years ago by the present proprietors, Messrs. Jason Springer and W. H. Salsbury, and the volume of business has increased year by year. The mill is located at the southeast corner of Spear and Mission streets, is three stories high and covers one fifty-vara lot. Two water lots in the immediate vicinity are also used by the firm as lumber yards. The mill is provided with the most approved machinery and appliances in use, and gives employment to a large force of well-skilled mechanics. The firm manufacturers and deals largely in doors, windows, sashes, blinds, sugar pine, lumber, frames, brackets, mouldings of all descriptions, etc., etc., and the work turned out is always first-class. Besides the firm owns and operates a large sawmill and factory in Butte County, where is manufactured all of the lumber and stock sizes of sashes, doors, blinds, etc. The volume of trade extends throughout the entire coast, to Australia and to the South Sea Islands.

NOTES:
"50-vara lot": 1 vara = 32.8748 inches (33 1/3"), 50 vara = 1643.74 inches or 45 2/3 yards. Source: http://www.sizes.com/units/vara_Texas.htm